Jynx [4N]-OU Lead

[Afti]

I've been using this for a while. It's an excellent lead, capable of rendering entire teams completely useless on occasion. It's probably the best Jynx set for use in OU, since the sweepers are simply SR fodder. Its only real problem is Jynx's Defense, which means it has to be played very carefully.


[SET]
Name: OU Lead
move 1: Trick
move 2: Lovely Kiss
move 3: Taunt
move 4: Ice Beam
item: Choice Scarf
ability: Forewarn
nature: Timid
evs: 4 HP/252 SpA/252 Spe

[SET COMMENTS]

<p>Jynx is a somewhat unusual lead, being completely incapable of laying down entry hazards; however, this doesn't necessarily make her a poor choice. Thanks to her Choice Scarf, she can outspeed the vast majority of Pokemon in OU, cripple things with Trick, Taunt slower leads to prevent them from laying down entry hazards, put her opponents to sleep with one of the game's better sleep-inducing moves, or simply put that excellent Special Attack to use, with a powerful STAB Ice Beam. Altogether, she has an excellent set of options for incapacitating the opponent's lead and then starting to scout. Forewarn helps in this; while seeing the opponent's move of highest Base Power Attack seems of little use, being able to tell if, say, Salamence or Latias is running Draco Meteor can be extremely useful.</p>

<p>This isn't to say that Jynx can just be plopped in a team without any thought, though. Jynx is extremely frail, and a priority-using lead, or one of the few that's faster than her, can potentially ruin her game. Luckily, most common leads run Focus Sash, allowing Jynx to safely Sleep them, or, depending on their bulk, hit them with a STAB Ice Beam, to incapacitate them. Nonetheless, this tactic is risky as Lovely Kiss has only 70 accuracy, meaning that Jynx will let you down a little over a quarter of the time. Some opposing leads can also shrug off its only attack, Ice Beam; thus, it is crucial to have safe switch-ins to threats like Scizor and Metagross, which can safely come in on Ice Beam and then Bullet Punch Jynx to death. Furthermore, instead of merely killing Jynx, several steel type threats, such as Heatran and Lucario, may use this locked Ice move to set up on Jynx and attempt a sweep. As such, Rotom-H makes an excellent teammate, switching on with Steel-types with impunity and then Overheating to eliminate them. Other excellent teammates include Suicune, which is very bulky, resistant to Steel, and preys on Special Defense- not a strong point of the Steel-types that love to brutalize Jynx. Magnezone is also a viable team option, as Jynx is likely to attract many trappable steels- not only Scizor and Metagross, but also Skarmory and Forretress, who would see an opportunity to set up Spikes on a locked Ice Beam. It should be noted, though, that Skarmory is slower than Jynx, and is 2HKOed by Ice Beam; as such, it can only set up one layer of Spikes.</p>

<p>One of the neat things about Jynx as a lead is that, unlike many fast and frail leads, she has the potential to last late into the match if used with care, thanks to her ability to put to sleep those who may seek to kill her off early. So, it can double as a late-game cleaner, finishing off battered tanks. If she has retained her scarf then Jynx will also work well as a check to Latias and Salamence, although not Dragonite, as Jynx fears ExtremeSpeed. Don't rely on this, though; Jynx is extremely frail, and crumples in a stiff breeze. Reliance on her survival into the endgame may result in losing games frequently, as if Jynx encounters an unanticipated physical attack on a switch-in she will most likely be KOed.</p>
​

<p>As a minor side note, while Perish Song looks appealing as a way to force switches, it is not advisable to use it. Anything with a decently powerful physical attack can brutalize Jynx before needing to switch out under Perish Song; ergo, despite its accuracy, Lovely Kiss is the far more reliable way to incapacitate enemies.</p>

 

[Colonel M]

I'm quite skeptical of this set, but it doesn't sound bad in practice. Is it possible to get some logs on this please to show this set's success?

 

[Afti]

Sure thing.

This is simply what happens when it incapacitates the lead and is then forced out.

Rules: Ladder Match, Sleep Clause, Freeze Clause, OHKO Clause, Evasion Clause, Species Clause, Strict Damage Clause, Soul Dew Clause
thegreensalde sent out Crobat (lvl 100 Crobat ?).
Afti sent out Doria (lvl 100 Jynx ?).
Doria foresaw Heat Wave!
Doria used Ice Beam.
It's super effective!
Crobat lost 100% of its health.
Crobat hung on using its Focus Sash!
Crobat used Taunt.
Doria fell for the taunt!
---
thegreensalde switched in Scizor (lvl 100 Scizor ?).
Afti switched in Gyarados (lvl 100 Gyarados ?).
Gyarados's intimidate cut Scizor's attack!
---
thegreensalde switched in Jolteon (lvl 100 Jolteon ?).
Gyarados used Dragon Dance.
Gyarados's attack was raised.
Gyarados's speed was raised.

Crobat is rendered useless, understanding of its weaknesses leads to a switchin of Gyarados, Scizor comes in as expected, and Gyarados gets a free Dragon Dance. (That being said, I'll note that I did crap with this; Gyarados died horribly to Jolteon, obviously, and I wound up losing this game.)

Rules: Ladder Match, Sleep Clause, Freeze Clause, OHKO Clause, Evasion Clause, Species Clause, Strict Damage Clause, Soul Dew Clause
Afti sent out Doria (lvl 100 Jynx ?).
nooby noob sent out Penguin (lvl 100 Empoleon ?).
Doria foresaw Hydro Pump!
Doria used Trick.
Doria obtained Focus Sash!
Penguin obtained Choice Scarf!
Penguin used Stealth Rock.
Pointed stones float in the air around the foe's team!
---
nooby noob switched in Nurse (lvl 100 Blissey ?).
Doria used Lovely Kiss.
Nurse fell asleep!
---
nooby noob switched in Toaster (lvl 100 Rotom-h).
Doria used Ice Beam.
Toaster lost 46% of its health.
Toaster was frozen solid!
Toaster's leftovers restored its health a little!
Toaster restored 6% of its health.
---
nooby noob switched in Nurse (lvl 100 Blissey ?).
Doria used Trick.
Doria obtained Leftovers!
Nurse obtained Focus Sash!
---
Doria used Taunt.
Nurse fell for the taunt!
Nurse used Thunderbolt.
Doria lost 24% of its health.
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
Doria used Lovely Kiss.
Nurse fell asleep!
Nurse is fast asleep!
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
nooby noob switched in Penguin (lvl 100 Empoleon ?).
Doria used Ice Beam.
It's not very effective...
Penguin lost 11% of its health.
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
Penguin used Aqua Jet.
Doria lost 32% of its health.
Doria used Lovely Kiss.
Penguin fell asleep!
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
nooby noob switched in Nurse (lvl 100 Blissey ?).
Doria used Ice Beam.
Nurse lost 15% of its health.
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
Doria used Ice Beam.
Nurse lost 13% of its health.
Nurse used Thunderbolt.
Doria lost 23% of its health.
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
Doria used Ice Beam.
Nurse lost 13% of its health.
Nurse used Thunderbolt.
Doria lost 23% of its health.
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
Doria used Taunt.
Nurse fell for the taunt!
Nurse used Thunderbolt.
Doria lost 24% of its health.
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
Doria used Ice Beam.
Nurse lost 15% of its health.
Nurse used Thunderbolt.
Doria lost 22% of its health.
Doria's leftovers restored its health a little!
Doria restored 6% of its health.
---
Doria used Ice Beam.
Nurse lost 15% of its health.
Nurse used Thunderbolt.
Doria lost 8% of its health.
Afti's Doria fainted.
Nurse's taunt wore off!
---
Afti switched in Scizor (lvl 100 Scizor ?).
Pointed stones dug into Scizor.
Scizor lost 12% of its health.
Scizor used Pursuit.
Nurse lost 29% of its health.
nooby noob's Nurse fainted.

Here, Jynx ravages half this guy's team before it bites the bullet, largely via item redistribution.

Rules: Ladder Match, Sleep Clause, Freeze Clause, OHKO Clause, Evasion Clause, Species Clause, Strict Damage Clause, Soul Dew Clause
Chicken_God sent out Crobat (lvl 100 Crobat ?).
Afti sent out Doria (lvl 100 Jynx ?).
Doria foresaw Brave Bird!
Doria used Ice Beam.
It's super effective!
Crobat lost 100% of its health.
Chicken_God's Crobat fainted.
---
Chicken_God switched in Mismagius (lvl 100 Mismagius ?).
Choice Scarf prohibits the use of this move.
Doria used Ice Beam.
Mismagius lost 38% of its health.
Mismagius used Substitute.
Mismagius lost 25% of its health.
Mismagius made a substitute!
Mismagius's leftovers restored its health a little!
Mismagius restored 6% of its health.
---
Doria used Ice Beam.
The substitute took damage for Mismagius!
Mismagius's substitute faded!
Mismagius used Pain Split.
Mismagius restored 20% of its health.
Doria lost 24% of its health.
Mismagius's leftovers restored its health a little!
Mismagius restored 6% of its health.
---
Doria used Ice Beam.
Mismagius lost 34% of its health.
Mismagius used Shadow Ball.
It's super effective!
Doria lost 76% of its health.
Afti's Doria fainted.
Mismagius's leftovers restored its health a little!
Mismagius restored 6% of its health.
---
Afti switched in Rotom-h (lvl 100 Rotom-h).
Mismagius used Shadow Ball.
It's super effective!
Rotom-h lost 62% of its health.
Rotom-h used Shadow Ball.
It's super effective!
Mismagius lost 42% of its health.
Chicken_God's Mismagius fainted.

Jynx kills Crobat before it accomplishes anything, and does decent damage to Mismagius before dying.

Rules: Ladder Match, Sleep Clause, Freeze Clause, OHKO Clause, Evasion Clause, Species Clause, Strict Damage Clause, Soul Dew Clause
noahem sent out Bronzong (lvl 100 Bronzong).
Afti sent out Doria (lvl 100 Jynx ?).
Doria foresaw Explosion!
Doria used Trick.
Doria obtained Macho Brace!
Bronzong obtained Choice Scarf!
Bronzong used Stealth Rock.
Pointed stones float in the air around the foe's team!
---
noahem switched in Rotom-h (lvl 100 Rotom-h).
Doria used Lovely Kiss.
Rotom-h fell asleep!
---
noahem switched in Bronzong (lvl 100 Bronzong).
Doria used Trick.
Doria obtained Choice Scarf!
Bronzong obtained Macho Brace!
---
Doria used Trick.
Doria obtained Macho Brace!
Bronzong obtained Choice Scarf!
Bronzong used Gyro Ball.
It's super effective!
Doria lost 100% of its health.
Afti's Doria fainted.

This is one of the points you have to be careful about- here, Jynx did very little because I didn't switch when I should have, so Bronzong got its Macho Brace back and killed it stone-dead.

Rules: Ladder Match, Sleep Clause, Freeze Clause, OHKO Clause, Evasion Clause, Species Clause, Strict Damage Clause, Soul Dew Clause
OperationBlade sent out Gliscor (lvl 100 Gliscor ?).
Afti sent out Doria (lvl 100 Jynx ?).
Doria foresaw Earthquake!
Doria used Ice Beam.
It's super effective!
Gliscor lost 100% of its health.
OperationBlade's Gliscor fainted.
---
OperationBlade switched in Empoleon (lvl 100 Empoleon ?).
Afti switched in Scizor (lvl 100 Scizor ?).
Empoleon used Agility.
Empoleon's speed was sharply raised.
---
...
---
Gyarados used Waterfall.
Rotom-h lost 45% of its health.
Gyarados lost 5% of its health.
Afti's Gyarados fainted.
Rotom-h used Will-o-wisp.
But there was no target!
Rotom-h's leftovers restored its health a little!
Rotom-h restored 6% of its health.
---
Afti switched in Doria (lvl 100 Jynx ?).
Doria foresaw Overheat!
Doria used Ice Beam.
Rotom-h lost 21% of its health.
OperationBlade's Rotom-h fainted.
---
OperationBlade switched in Scizor (lvl 100 Scizor ?).
Pointed stones dug into Scizor.
Scizor lost 12% of its health.
Afti switched in Gliscor (lvl 100 Gliscor ?).
Scizor used Bullet Punch.
Gliscor lost 26% of its health.
Afti's Gliscor fainted.
---
...
---
---
OperationBlade switched in Latias (lvl 100 Latias ?).
Pointed stones dug into Latias.
Latias lost 12% of its health.
Latias used Draco Meteor.
It's super effective!
Salamence lost 44% of its health.
Afti's Salamence fainted.
Latias's special attack was harshly lowered.
---
Afti switched in Doria (lvl 100 Jynx ?).
Doria foresaw Draco Meteor!
Latias used Draco Meteor.
Latias's attack missed!
Doria used Ice Beam.
It's super effective!
Latias lost 85% of its health.
---
Latias used Draco Meteor.
Latias's attack missed!
Doria used Ice Beam.
It's super effective!
Latias lost 3% of its health.
OperationBlade's Latias fainted.
---
OperationBlade switched in Heatran (lvl 100 Heatran ?).
Pointed stones dug into Heatran.
Heatran lost 12% of its health.
Doria used Ice Beam.
It's not very effective...
Heatran lost 8% of its health.
Heatran used Substitute.
Heatran lost 25% of its health.
Heatran made a substitute!
Heatran's leftovers restored its health a little!
Heatran restored 6% of its health.
---
Doria used Ice Beam.
It's not very effective...
The substitute took damage for Heatran!
Heatran used Lava Plume.
It's super effective!
Doria lost 99% of its health.
Heatran's leftovers restored its health a little!
Heatran restored 6% of its health.
---
OperationBlade: gg
Afti: GG
Doria used Ice Beam.
It's not very effective...
The substitute took damage for Heatran!
Heatran used Lava Plume.
It's super effective!
Doria lost 1% of its health.
Afti's Doria fainted.
OperationBlade wins!

Big piece of this log involving Jynx, which illustrates Jynx eliminating the opposing lead, Jynx's ability to come back in, Jynx finishing off an injured Rotom, killing Latias, and illustrating why Jynx as your last Pokemon is a bad thing.


I'll admit my actual playing skills are poor, but hopefully what Jynx accomplishes will convince you of its merit, even if I fail to make use of the advantages it give me a lot of the time.

 

[Tarquin]

I am still unconvinced by these logs, many of them involve great luck and it's hard to see why jinx is better against more normal leads, like Metagross and Swampert, then normaly trickscarfers, like Azelf, Metagross, Jirachi and Uxie.

The speed of Jinx and it;s STAB Ice Beam is to be considered, as it did well to OHKO both Crobats (ignoring sash) and Gliscor, before they could even move. However, by your logs, once Jinx has tricked away it's scarf, it kind of needs hax to stand up in the metagame. Notice how it froze Rotom, who may well have OHKOed Jinx, then only managed to beat Latias as Draco Meteor misses TWICE.

Despite all this, I think it does have some uses and having a sleeper and a tricker on a team is always nice, especially as a lead, so I think it should get a set in the analysis.... just.

Editing
[SET COMMENTS]

Changed Sentences


<p>Jynx is a somewhat unusual lead, being completely incapable of laying down entry hazards. However, this doesn't necessarily make it a poor choice. Thanks to it's Choice Scarf, it can outspeed the vast majority of Pokemon in OU, it can cripple things with Trick , Taunt slower leads to prevent them from laying down entry hazards, put its opponents to sleep with one of the game's better sleep-inducing moves, or simply put that excellent Special Attack to use in conjunction with a powerful STAB Ice Beam. Altogether, it has an excellent set of options for incapacitating the opponent's lead and then starting to scout. Forewarn helps in this- while seeing the opponent's move of highest Base Power Attack seems of little use, being able to tell if, say, Salamence or Latias is running Draco Meteor can be extremely useful.</p>

<p>This isn't to say that Jynx can just be plopped in a team without any thought, though. Jynx is extremely weak, defensively, and a priority-using lead, or one of the few that's faster than it, can potentially ruin it's game. Luckily, most common leads run Focus Sash, allowing Jynx to safely Sleep them, or, depending on their bulk, hit them with a STAB Ice Beam, to incapacitate them. Nonetheless, this tactic is risky as Lovely Kiss has only 70 accuracy, meaning there will be regular time when Jinx will let you down. Some opposing leads can also shrug off it's only attack, Ice Beam; thus, it is crucial to have safe switch-ins to threats like Scizor and Metagross, which can safely come in on Ice Beam and then Bullet Punch Jynx to death. Also, instead of merely killing Jinx, several steel type threats, such as Heatran and Lucario, may use this locked Ice move to set up on Jinx and attempt a sweep. As such, Rotom-H makes an excellent teammate, switching on with Steel-types with impunity and then Overheating to eliminate them. Other excellent teammates include Suicune, which is very bulky, resistant to Steel, and preys on Special Defense- not a strong point of the Steel-types that love to brutalize Jynx. Magnezone is also a viable team option, as Jinx is likely to attract many trappable steels, including Scizor and Metagross, but also Skarmory and Forretress, who would see an opportunity to set up spikes on a locked Ice Beam. </p>

<p>One of the neat things about Jynx as a lead is that, unlike many fast and frail leads, it has the potential to last late into the match if used with care, thanks to it's ability to put to sleep those who may seek to kill her off early. So, it can double as a late-game cleaner, finishing off battered tanks. If it has retained its scarf then Jinx will also work well as a check to Latias and Salamence, although not Dragonite, as Jinx fears extremespeed. Don't rely on this, though; Jynx is extremely frail, and crumples in a stiff breeze. Reliance on its survival into the endgame may result in losing games frequently, as Jynx encounters an unanticipated physical attack on a switch in she may well get prematurely KOed.</p>

<p>As a minor side note, while Perish Song looks appealing as a way to force switches, it is not advisable to use it. Anything with a decently powerful physical attack can brutalize Jynx before it can switch out after using perish song so, despite its accuracy, Lovely Kiss is far more reliable at incapacitating enemies.</p>

Hope this all helps! ^^

 

[Roflmao23]

I've been using this for a while. It's an excellent lead, capable of rendering entire teams completely useless on occasion. It's probably the best Jynx set for use in OU, since the sweepers are simply SR fodder. Its only real problem is Jynx's Defense, which means it has to be played very carefully.

[SET]
Name: OU Lead
move 1: Trick
move 2: Lovely Kiss
move 3: Taunt
move 4: Ice Beam
item: Choice Scarf
ability: Forewarn
nature: Timid
evs: 4 HP/[Space]252 SpA[Space]/[Space]252 Spe

[SET COMMENTS]

<p>Jynx is a somewhat atypical lead, being completely incapable of laying down entry hazards(;) however, this doesn't make it a poor choice. Faster than the vast majority of Pokemon in OU, it can hobble things with its Choice Scarf, Taunt other[Deleted comma] slower leads to prevent them from laying down entry hazards, put its opponents to sleep with one of the game's better sleep-inducing moves, or simply put that excellent Special Attack to use(,) killing things. Altogether, it has an excellent set of options for incapacitating the opponent's lead and then starting to scout. Forewarn helps in this(:) while seeing the opponent's move of highest Base Power seems of little use, being able to tell if, say, Salamence or Latias is running Draco Meteor can be extremely useful.</p>

<p>This isn't to say that Jynx can just be plopped in a team without any thought(;) though(,) Jynx is extremely [Removed] frail, and a priority-using lead, or one of the few that's faster than it, can do nasty things to it. Luckily, most common leads run Focus Sash, allowing Jynx to safely Sleep them, or, depending on their bulk, hit them with a STAB Ice Beam, to incapacitate them. However, [Removed] Lovely Kiss is risky, at 70 Accuracy, and some can survive an Ice Beam; thus, it is crucial to have safe switch-ins to threats like Scizor, which can safely come in on Ice Beam and then Bullet Punch Jynx to death, and Metagross, which does similarly. As such, Rotom-H makes an excellent teammate, switching on with Steel-types with impunity and then Overheating to eliminate them. Other excellent teammates include Suicune, which is very bulky, resistant to Steel, and preys on Special Defense(.) (Not a strong point of the Steel-types that love to brutalize Jynx.) IMO you should elaborate more Team Options.</p>

<p>One of the neat things about Jynx as a lead is that, unlike many fast, frail leads, it will often survive, played properly. So, it can double as a late-game cleaner, finishing off battered walls. Don't rely on this, though; Jynx is extremely frail, and crumples in a stiff breeze. Reliance on its survival into the endgame will result in you losing games frequently, as Jynx encounters an unanticipated physical attack that leaves it reeling.</p>

<p>As a minor side note, while Perish Song looks appealing as a way to force switches, don't use it. Anything with a decently powerful physical attack can brutalize Jynx before it needs to leave; despite its accuracy, Lovely Kiss is far more reliable.</p>

This was an interesting analysis to read...I might try this latter.
Good work. ;)

 

[Afti]

I am still unconvinced by these logs, many of them involve great luck and it's hard to see why jinx is better against more normal leads, like Metagross and Swampert, then normaly trickscarfers, like Azelf, Metagross, Jirachi and Uxie.

The speed of Jinx and it;s STAB Ice Beam is to be considered, as it did well to OHKO both Crobats (ignoring sash) and Gliscor, before they could even move. However, by your logs, once Jinx has tricked away it's scarf, it kind of needs hax to stand up in the metagame. Notice how it froze Rotom, who may well have OHKOed Jinx, then only managed to beat Latias as Draco Meteor misses TWICE.

Despite all this, I think it does have some uses and having a sleeper and a tricker on a team is always nice, especially as a lead, so I think it should get a set in the analysis.... just.

Jynx has Lovely Kiss and STAB Ice Beam above other Trickscarfers.

In addition, Jynx's 95 SpD is decent enough. Rotom had Leftovers- Shadow Ball/Overheat would be a 2HKO, so Jynx could feasibly get the kill- it has 2HKO potential assuming it's the normal physically bulky build. Would have lost health enough that I couldn't do that team-kill thing, though. Just have a scarfed Empoleon and a dead Rotom (or Jynx; it could go either way, but the odds are decent)

Latias was killed by hax, though- Scarftias (this one; faster than a still-scarfed Jynx) gets a 2HKO on Jynx, but is faster; Specstias gets a 1HKO, but is slower. Both get a crippling-but-not-fatal Ice Beam.

Will add the grammar/comment fixes now.

 

[mtr]

I am still unconvinced by these logs, many of them involve great luck and it's hard to see why jinx is better against more normal leads, like Metagross and Swampert, then normaly trickscarfers, like Azelf, Metagross, Jirachi and Uxie.

If not logs, We'd at least like a "Leads List" showing how you expect matchups to play out against the top 11 leads (can't forget Hippo...).

 

[Colonel M]

To be honest I think this should be geared more toward UU with the mention of OU. Thoughts on this at least?

(Hey, at least it can fuck up Froslass).

 

[Raverist]

I believe it's worth noting that Infernape and Weavile leads utterly rape this thing. If Fake Out doesn't kill, then their priority moves (especially Infernape's) will spell doom. Jirachi also completely outclasses Jynx, with a single Iron Head killing her, and the fact that Jirachi leads are always faster with scarfs makes for a nice idea simply outclassed. It's as bad in UU, where Hitmontop and Ambipom will easily terminate her with one move, abusing her phenomenal base 35 defense to the greatest idiom. Even then, my analysis shows that while Jynx can beat some leads, everything else just makes a monkey out of her in absolutely no time whatsoever.

This thing doesn't work.

 

[Farewell]

Altho this is a lead, consider packing Blizzard for Hail teams. If saved for mid-late game as a sweeper, Jynx's Blizzard allows for more KOs i.e. 1hkos on Azelf/Gengar with Hail damage factored in, and better 1KOs on bulkier Latias.

Blizzard also won't miss against Mamoswine/Froslass in the Hail, so opposing Hail teams wont be able to abuse their abilities per say.

 

[Fuzznip]

I'm not too certain about the viability of this set in OU. There are numerous amounts of leads that beat Jynx one on one. For example, here's the list of top 10 leads in OU:

Azelf: It depends on what it uses first. You win if it uses Stealth Rock, you lose if it uses Fire Blast (which it probably will). You can switch out if you Trick it into uses Fire Blast (holding on to Focus Sash) and switch to Heatran I guess if you use it.
Metagross: You'll always lose.
Jirachi: You'll always lose.
Aerodactyl: Same goes for Azelf. You win if it uses Stealth Rock, you lose if it uses Stone Edge, unless you Trick its Focus Sash and switch out to prevent Aerodactyl to kill off Jynx.
Swampert: You'll lose unless you Trick it into using Stealth Rock.
Smeargle: You'll probably win.
Infernape: You'll lose here.
Roserade: Depends on what it uses. Leaf Storm or Sleep Powder and Jynx will be in trouble, it can use Trick to stealth the Focus Sash though and switch out later.
Ninjask: You won't kill it before it uses Baton Pass if it has Protect.
Heatran: You'll lose.

Out of those 10 leads, you are stopped by 5 (Metagross, Jirachi, Swampert, Infernape, Heatran) leads 100% of the time, while you beat 1 lead (Smeargle) 100% of the time. As for the other leads, it depends on what they use first to see who comes on top. You can obviously use Lovely Kiss on them first turn or Trick if you get lucky into trapping them to use Stealth Rock, but the 75% accuracy is brutal and the opposing lead will not always use Stealth Rock first turn, not to mention you have to switch out as well when you do put them to sleep.

To be honest, I'm not buying this set myself. I doubt it's even better in UU, since Ambipom/Moltres/Arcanine/Uxie/Mesprit and possibly Electrode will generally beat it and/or get their job done.

 

[Colonel M]

The thing is you can possibly use Lovely Kiss on many of the leads in UU. I don't know how many of them actually carry Lum Berry (I've only played it for a week but I got a slight grasp of the concept), so it might have some effect there.

 

[Zoom]

PS: My English is horrible, but I try my best

Lead Jynx is somehow OK and after testing it, it is better then expected, but I don't think it's good enough to be a successful lead in OU. She's very frail and lose against the most common leads.

Jynx
move 1: Trick
move 2: Lovely Kiss
move 3: Taunt
move 4: Ice Beam
item: Choice Scarf
ability: Forewarn
nature: Timid
evs: 4 HP/252 SpA/252 Spe

vs the 11 most used leads

Azelf - It's somehow OK...
Jynx outspeeds it, beside Azelf is also scarfed.
-> Jynx can trick Azelf into Stealth Rock, Taunt or Fire Blast (red, when you don't have a Heatran)
-> Jynx can sleep it 75% of the time
-> Ice Beam is a 2HKO; Azelf's FB is a 1HKO 87.18% of the time; 74.103%, when you consider the miss rate of FB
-> Jynx will win by using IB, when Azelf uses SR or Taunt the first turn, or 25,897% of the time, when Azelf uses FB

Metagross - You'll always lose, without doing anything
Metagross' Bullet Punch is a 1HKO, you can't do anything beside switching, or dying horribly.

Jirachi - Wait, there's hope!
Jynx will outspeed scarf'd Jolly Jirachi with 176Spe-EVs, the usual lead. You're only hope is to rely on Lovely Kiss, or switch into Magnezone, because Jirachi's flinchhead and U-Turn will make you fail.
PS: Jolly Jirachi with more than 216Spe-EVs will outspeed you.

Aerodactyl - Not that bad
Jynx always outspeeds it, beside Aerodactyl is also scarfed.
-> You can trick Aerodactyl into SR, Taunt or Stone Edge
-> You can sleep it 75% of the time
-> Ice Beam is a 1HKO (2HKO, because of Focus Sash) , whereas Aerodactyl's Stone Edge will always kill, beside it misses.

Swampert - Not that bad
Jynx will always outspeed it
-> You can trick Swampert into SR, EQ, or Surf
-> You can sleep it 75% of the time, beside it has a Lum Berry
-> Ice Beam is a 3HKO, Swampert's EQ is a 2HKO; Swampert's Surf is also a 2HKO

Smeargle - Awesome!
Jynx will always outspeed it
-> You can taunt it, making it completely useless!
-> You can sleep it 75% of the time, but be aware of Spore
-> You can trick it, making it useless (but it will probably use Spore on you)
-> Ice Beam is a 1HKO (a 2HKO, because of Focus Sash), but you will lose, because of Spore

Infernape - It's bad
Jynx will outspeed it, beside Infernape is scarfed.
-> Infernape's Fake Out from typical lead-Infernape will deal 26.10%-30.88% (a lot more, when Infernape concentrates to be physical, but it won't kill. LO max atk adamant Infernape will deal 55% max)
-> After Fake Out, you can trick Infernape into SR, CC, or Flare Blitz.
-> You can sleep it 75% of the time, after Fake Out, beside it has Lum Berry
-> All of Infernape's STAB will kill you. Jynx's IB is a 3HKO-4HKO

Roserade - Hey, it could be worse
Jynx will always outspeed it
-> You can trick it into Toxic Spikes, Sleep Powder, Leaf Storm and HP Fire, it's not that bad
-> You can taunt her, so she can't do her job. It's a good option
-> IB is a 1HKO (, actually a 2HKO, because of Focus Sash); Roserade's Leaf Storm and HP Fire are both a 1HKO

Ninjask - It's OK
Jynx will outspeed it in the first turn, beside it's scarfed. After one turn, Ninjask will outspeed Jynx.
-> You can trick it, making it useless, beside it has Protect. So, it can sub the second turn, outspeeding you and have a fantastic BP.
-> You can taunt him, making it useless. But it can still BP +1Spe, when it has Protect, making you being locked into Taunt on the receiver.
-> You can sleep him 75% of the time, beside it has Protect. So, you will try to sleep a sub in the second turn.
-> IB is a 1HKO, actually a 2HKO, because of Focus Sash. It can still safely have a good BP, because of Protect + Sub. Bad news: X-Scissor is a 1HKO on Jynx.

Heatran - It's bad
Jynx will always outspeed Heatran.
-> You can trick it into SR, or a fire attack, making it predictable and an awesome revenge killer.
-> You can taunt him, hoping he won't use a fire attack in the first turn.
-> You can sleep it 75% of the time, beside it has a Lum Berry.
-> Flamethrower and Fire Blast will kill you. IB is a 10HKO (lol)... without Leftovers

Hippowdon - It's OK
Jynx will always outspeed the big Hippo.
-> You can trick it into SR, EQ, or SE.
-> You can taunt him, making him predictable.
-> You can sleep it 75% of the time, beside it has a Lum Berry.
-> IB is a 2HKO. Hippo's EQ is a 1HKO, as well Hippo's SE, beside it misses.


=> Jynx is a bad lead. All leads, beside Smeargle will kill Jynx earlier than Jynx will kill them. The good thing is: In theory Jynx can hinder all leads, beside Metagross and Jolly Jirachi with more than 216Spe to lay down their entry hazards. The bad thing is: Jynx will die, making it lose a team member early. The entry hazards can be layed down later by your enemy. When using Jynx, you can only hope that you can trick your scarf on someone laying down SR, than he switches into someone and your sleep will not miss and than he switches into something you can kill with Ice Beam. Yeah, this won't happen.

Jynx is to frail to be used later, because it takes 25% from SR and it has so bad defense, it won't live long and won't take even one hit. It hasn't very good offense to balance her defense-weakness. Heck, even Alakazam looks like a tank when compared to Jynx and yes, he is also a better lead.

Sry, but Jynx is a bad lead, but I think it surprises. That's probably her best bet, along with being able to trick, sleep, having STAB ice attacks and Forewarn. Unluckily, all of these advantages are destroyed by her horrible typing and her awful defenses.

That's just my opinion and sry for my grammar and bad spelling.

 

[Legacy Raider]

After reading the responses in the thread, as well as testing the set myself in a couple of battles, I'm sorry to say I'm really quite unimpressed. Jynx's typing is horrible, it's physical defense a joke, and Smeargle can run a very similar set far more effectively (but with a 100% accurate Spore compared to Jynx's 75% Lovely Kiss, and the ability to set up Stealth Rock and Spikes). Forewarn is pretty cool, but the vast majority of leads you would be able to recite their set just by looking at them anyway.

Locking.