I dont understand why carracosta is in A-. Should be B or B-. It is outclassed by barbaracle as a shell smasher and outclassed by rhydon as a check to normal and fire types.
Zangoose is too high aswell imo. Its speed is just too lackluster when you have options like tauros, it doesnt hit as hard but speed is way more important in this meta. Zangoose was good in BW when you had to break through tangela and alomomola, but in this gen it seems to always dissapoint. It does good against teams that are very slow and bulky, but even then you have to predict right with facade and close combat because the opponent is probably going to try to wear you down with toxic damage and pivoting into stuff like ferroseed and rhydon to make you take toxic and iron barbs damage. Tauros has fire blast for ferroseed and can live an eq from rhydon, and iron head/eq is a 3hko/4hko if I remember correctly. Imo it should be B or B-
Prinplup is a very solid defogger and check to physical attackers in general and can also switch into fire types atleast once. Should be A
I think Jumpluff should move to B+ because of its speed and access to sleep and SD. It cleans consistently if youre able too get rid of steels and priority users like shiftry.
And tbh the same thing counts for raichu. Its basically a special jumpluff. it can boost with NP and has the same speed stat. Its more difficult for it to set up because it doesnt have a sleep inducing move. But it is more powerful in return basically killing everything in one shot after a nasty plot boost. So if you manage to get rid of priority users and very specially bulky mons like hariyama it should be able to win the game. C is just criminally low. Id put it in B because its splashability is pretty bad. Its a hard pokemon to build around.
Haven't gone around to posting in the new viability rankings yet so I thought I would give my thoughts on things I've seen in here. Also good job with the new rankings they are much much better.
Carracosta Drops to B Ranks - Heck No
Carracosta definitely earns A- rank. It is probably the most definitive A- mon to me no way it should ever drop into the B ranks, and honestly your post reads as someone who has seemingly never used Carracosta at least not properly.
The Defensive Stealth rock set definitely draws comparisons to Tank Rhydon but Carracosta checks many top tier threats much better than Rhydon does. Archeops may not be S rank anymore but is very much still a threat and Carracosta is this tier's single best check to it. Earthquake is a 4hko factoring in lefties and archeops can't just rely on slapping on Aqua tail for major damage like it can for Rhydon. Carracosta can then just scald away burning potentially burning any switch ins or bringing Archeops down to like 18%. If you run aqua jet, which in my opinion is the best use of its 4th move slot, it is one of the few pokemon that can 100% beat sash endeavor archeops which still super common on Hyper Offense.
Also Also Carracosta while it really should run lefties most of the time isn't 100% reliant on its item unlike Rhydon it can run berries to lure in various threats such as Lum berry to 1v1 Sash Vivillon with the combination of Rock Slide+Aqua jet (just one example).
Scald is super nice not just for the obvious reasons but it is a spammable 100% accurate move that Rhydon really wishes it had. Every competent team has multiple ground immunities and Rhydon's Stone edge & Megahorn while strong are innacurate. Also Carracosta can adjust its 4th moveslot with a bit more freedom than Rhydon to fit its 4th moveslot to accompany team needs. Aqua jet, Toxic, Ice Beam, and protect are all options I've tried on it with good success, knock off is also an option but not as good in my opinion.
Speaking of scald Carracosta can go both mixed and special making it both unpredictable and deadly as would be checks or mons that could take a hit to the physical shell smash set may be straight OHKO'd by common mixed or special shell smash variants which is a huge advantage over barbaracle. For example you send out barbaracle opponent switches into Weezing you SSmash on the switch and fail to OHKO and get burned and you are now crippled (Yes Lum berry is a thing but you should really be running shuca if using Barbaracle). Where as Carracosta can just as easily be in the same situation but surprise opponents with mixed sets and even if you get burned you are still a scary +2, +2 carracosta with a non crippled hydro pump. Also Carracosta with its better defenses + solid rock sets up Shell smashes way easier than barbaracle.
Moving onto other nominations I'll keep them brief because Carracosta was the big discussion point and most of these noms are pretty straightforward.
Zangoose Drop to B rank - No
I find it odd that of the things to use as your main claim to support your nom for Zangoose to move down is its speed. Yea base 90 isn't the fastest but you still outspeed the majority of the meta including the base 85 speed tier if jolly as well as the base 80s and 70s which makes up the large majority of the entire offensive tier lol. And you forgot to mention in your post complaining about why there is little to reason to use Zangoose over Tauros who has better speed that Zangoose has a move called quick attack. Which combined with Zangoose's base 115 attack and toxic boost is one of the strongest priority moves in the tier that isn't reliant on your opponent attacking you (sucker punch).
252 Atk Guts Swellow Quick Attack vs. 0 HP / 0 Def Hitmonchan: 90-106 (37.3 - 43.9%) -- guaranteed 3HKO
252 Atk Toxic Boost Zangoose Quick Attack vs. 0 HP / 0 Def Hitmonchan: 109-130 (45.2 - 53.9%) -- 46.5% chance to 2HKO
Plus it actually 2hkos physical defensively mega audino.
252 Atk Life Orb Sheer Force Tauros Iron Head vs. 252 HP / 252+ Def Mega Audino: 151-179 (36.8 - 43.6%) -- guaranteed 3HKO
252+ Atk Toxic Boost Zangoose Facade (140 BP) vs. 252 HP / 252+ Def Mega Audino: 211-249 (51.4 - 60.7%) -- guaranteed 2HKO
Most of the time it will just stall you out with Wish/Protect but it is still a good indicator of its raw output. Your argument about how opponents can pivot between bulky mons a good amount of the time stalling out the toxic orb is a completely valid criticism though and I think it was a driving reason for it being dropped out of the A ranks. I don't think it validates it being dropped any further because Zangoose is still pretty threatening hitting even resists really hard.
Prinplup Rise to A Rank - Lol no
To be blunt Prinplup is not good in this meta i'd go as far to say it's garbage. Its far too passive and easily abused due to its sole reliance on scald and not much else. NU is not scarce on hazard control and has trouble being nearly as viable after the drops of Shiftry, Skuntank, Hitmonchan, and even Claydol. Generally other forms of hazard control are superior to prinplup on offensive and balance builds. Even on more stally teams Prinplup isn't generally really wanted because it lacks recovery. Prinplup is still probably better than the stuff in C rank and I'm happy you have had success with it but the idea of Prinplup in A rank in this current meta is honestly pretty laughable to me as I'd imagine it is for most people who have played NU as of recent.
Jumpluff to B+ - N/A
I've used jumpluff a decent amount but not the offensive SD Acro/Seed bomb set you are speaking of so I can't have a valid opinion on this. I will say though that from my experience Jumpluff's frailty sucks considering on the no item acro set it is still taking like ~45 from knock off and fighting moves. Evne then Jumpluff provides crazy amount of free turns with sleep powder, encore, and memento but I have a hard time seeing it as a rank above some of the very good mons in B rank like Mismagius or Liepard.
Raichu to C+ - Yea
Base 110 speed is wonderful. While really frail can beat sucker punch shenanigans with substitute and encore with the latter also giving it many opportunities for setting up a nasty plot. Archeops while definitely still used a lot isn't seeing the usage it used to so less coin flip speed ties. Has some issues with 4MSS but makes good revenge killer and lightingrod is nice just to deter volt switchers. Definitely a level above C with recent meta game trends (lol wtf is Servine doing in C rank). Also makes a semi-decent anti lead with sash as it can volt switch to break sashes and fire off grass knot/focus blast on common rock type stealth rock leads even encoring them into rocks.
Zebstrika to C+ - No
Not sure why people are trying to nom this zebra alongside Raichu, Raichu is definitely better. Speed isn't everything, Zebstrika's 80 base special attack is pitiful and it has no access to nasty plot. Its generally underwhelming and lacks KOing power and after like any prior damage completely is destroyed by like any form of priority and it doesn't have access to encore to get around sucker punch. Articfoxkeh pretty much sumed everything of note already up so I'll leave it at that but yea no dice.
Scyther to A+ - Yes
One of the better fighting resists in the tier, and one of the fewer fighting resists with instant recovery. Extremely diverse and unpredictable sets very fast and very strong. Appreciates Archeops slight decline in usage. Even if it is walled by stuff like Rhydon it can just U-Turn out like Mega Beedrill in UU a lot of the time it comes in secures kills with U-Turn and grabs momentum. Very customizable and splashable for teams. Hazard control is easier than ever and Scyther's 4x Stealth Rock weakness really is the only thing keeping it from being S rank at this point. Seriously this thing is really good right now I'd put it above some of the things in A+ like Pyroar.
Mesprit to A+ - Definitely
Do I have to say much? Mesprit is the most versatile pokemon in the entire tier and fits in so much role compression into one slot that I often find it hard to build a team without it. Check to ground types, fighting types, Dark types with colbur, malamar with signal beam, bulky grounds/rocks with energy ball, momentum grabber, wincon,
healing wish user, one of the best scarfers in the tier, calm mind psyshock beats mega audino,
healing wish user (in case you didn't catch it the first time), one of the best stealth rockers in the tier (can even prevent other rocks with imprison and xatu with skill swap). Forces your opponent to scout like crazy because it is just so insanely unpredictable, how is this thing not A+ rank it is better than like half the stuff there lol.
Vivillon from A to A- or B+ - Heck No
Not going to talk about this much since Megazard said pretty much everything that needed to be said. But vivillon wears down checks pretty fast because hurricane hits so hard it can run energy ball for bulky rocks and the endeavor sash set is still extremely deadly.
I've spent way too much time writing all this time to make any nominations of my own but I will say that I am a bit iffy on some of the placements in B+ and B. I fail to see how pokemon like Cacturne and Torterra are worthy of B+ rank who seem to me to be worst then a lot of things in B. While Mismagius and Liepard are in B rank and at least to me are better than most things in B and some things even in B+.