I'd like to revive this thread, if it's...okay. With the suspect testing of Mega Metagross, I have a question for you fellow Diancie users: do you feel that without Mega Metagross, Diancie is broken? People on the suspect thread have been whining about this subject, and I felt that this is a much more appropriate place to discuss the matter.
As far as my thinking goes, I never saw Diancie as a top-tier mon, but she isn't broken, in my opinion. If you're playing the suspect ladder and need help with defeating the now-rampant princess of diamonds, allow me to help. Because there's a lot of stuff that I'll compile into a relatively short list. Here we go.
- Super-effective coverage.
This is a no-brainer, but Diancie is weak to a lot, and I mean a lot of common types. You don't need to use just steel-types to stop her! She's also weak to water, ground, and grass-type moves, and even though the latter isn't as common, it's still a fine choice for checking her. She may have good defenses, but she almost always runs a -Def or - Sdef nature, which really brings out one of her biggest flaws - base 50 HP. That alone offsets those defenses that, alone, would be considered great. Many things check Diancie. These include, but are not limited to: Scarf Keldeo (OHKOs with Scald / Hydro Pump), Offensive DD Mega Altaria at +1 (this is a bit shaky, but if Altaria can gather a boost, she can OHKO with Earthquake. Unboosted, it does anywhere from 70% to 90%, so Diancie would just need a little bit of prior damage), Azumarill's Aqua Jet (with Avest, it does up to 73%. With CB, it does anywhere from 90% to a OHKO. You've got a 43% chance to kill her in one hit, LIVE a Moonblast, and do it again), SpD Gliscor (it needs 96 EVs in Attack to OHKO with Earthquake after SR. Otherwise it has a 43% chance to do so uninvested after SR), Heatran (use Scarf or Air Balloon, and run either Flash Cannon or Earth Power. That's a really reliable check right there...just don't switch into an Earth Power while using Scarf!), Landorus-I and Landorus-T (especially Scarf Landorus-T) can OHKO her with their respective ground-type moves, Mega Lopunny's HJK has a 75% to OHKO after SR...you get the point. Alongside them, you can use Steel Wing Talonflame, Celebi, Scarf or Sand Rush Excadrill, Ferrothorn with Gyro Ball, Scarf Garchomp, Mega Manectric to pivot out while doing a lot of damage, Mega Venusaur who is a full counter to her aside from rare Psyshock variants, Mega Scizor, Hippowdon to an extent, SpD Jirachi, Scarf Magnezone, Sash Mamoswine, Offensive Rapid Spin Starmie, Chansey can wall it for a bit, Aqua Tail Mega Aero, Amoonguss with Giga Drain, Sash Breloom, Dragonite with EQ at full health, Mega Sceptile, Scarf Earth Power Kyurem-B, Scarf Terrakion, Mega Swampert in rain, Crawdaunt's LO Aqua Jet (guaranteed one-shot after SR), Suicune who is a pretty dang good counter, Alomomola's Scald which deals up to 43% off of UNINVESTED BASE 40 SPA, Serperior, Tangrowth avest who is a full counter...I can go on and on. Look at this list. Look at the length of it. Most of these aren't situational things that you can't slap onto any team. Scarf Keldeo, Mega Altaria, and CB Azu are top-tier threats capable of wrecking her.
- Mold Breaker.
I didn't mention Mega Gyarados for a reason. Mold Breaker negates Magic Bounce and allows Gyarados to let loose on Diancie. At +1 speed it can reliably check her from full health, dealing obscene damage with its Waterfall attack - which has a 75% chance of OHKOing her after SR...at -1. At +0 it OHKOs no matter what.
It's a situational check, but if you have the right support you may be able to make it work. At +nothing Mega Gyara is outspeed and killed.
- Stealth Rock, Spikes, and Entry Hazards
Diancie has no form of recovery whatsoever bar her teammates. This means that repeated switch-ins will begin to chip away at her base 50 HP, which, being so low, is very important she retains. For something like Mega Metagross, who actually resists SR, and has actually decent HP, it's not as big a deal, but for Diancie, it is.
- Secondary effects
Magic Bounce does not negate secondary effects of attacks. She can still be frozen by Ice Punch, burned by Lava Plume, etc, right through her Magic Bounce ability. Though that does not usually happen it is noteworthy because being burned means that anything with decent SpD can wall her.
So that's that. My fingers even sorta hurt after typing all that, but hopefully I provided you guys with some insight. I always thought the day of Diancie's suspect would come, and it seems like now it's getting closer and closer.
tl;dr: diancie really isn't broken
