So nv already posted about Diancie, but it was in a wall of other things and I think it warrants a little more attention.
Diancie-Mega @ Diancite
Ability: Magic Bounce
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Moonblast
- Earth Power
- Calm Mind / Ancientpower / Hidden Power Rock / Hidden Power Fire
- Protect
This thing is blazingly fast, outspeeding almost everything after mega evolving and having an amazing ability, good offensive coverage and stats, and crying when it runs into either Skarmory or Charizard or whatever is relevant here.
EDIT:
I like Chopin's idea, not least because it makes Diancie even more incredibly OP (full disclosure, I knew Chopin was gonna post that idea, and posted my Diancie with that in mind).
Diancie-Mega @ Diancite
Ability: Magic Bounce
EVs: 252 SpA / 4 SpD / 252 Spe
Hardy Nature
IVs: 1 Atk / 30 Def / 30 SpD / 30 Spe
- Moonblast
- Earth Power
- Calm Mind
- Hidden Power [Rock]
Diancie-Mega @ Diancite
Ability: Magic Bounce
EVs: 252 HP / 252 Def / 4 SpA
Hardy Nature
IVs: 0 Atk
- Moonblast
- Rest
- Calm Mind
- Sleep Talk
Stats (Possibly. Can we get the decision on the mega evolution mechanics): 160 / 50 / 110 / 160 / 110 / 110
160 / 110 / 110 bulk, incredibly high attack power as always, great ability, good speed...
252 Atk Choice Band Huge Power Azumarill Waterfall vs. 252 HP / 252 Def Mega Diancie: 420-494 (80.1 - 94.2%) -- guaranteed 2HKO
It isn't killed by choice band 80 attack Azumarill's Waterfall, a super effective base 80 STAB move off of over 750 effective attack. This isn't meant to say you're beating Azumarill by any means, but merely to be an indication of the ridiculous bulk it gains. The only thing Diancie loses by doing this too is Diamond Storm.
Stats (possibly... can we get a decision on Mega evolution mechanics.): 160 / 50 / 110 / 160 / 110 / 110
Stats (possibly... can we get a decision on Mega evolution mechanics.): 160 / 50 / 110 / 160 / 110 / 110
EDIT EDIT:
Blissey (F) @ Choice Band / Choice Scarf
Ability: Serene Grace
EVs: 252 Atk / 4 Def / 252 Spe
Quirky Nature
- Headbutt
- Body Slam
- Rock Slide
- Thunder
Team Blissey, blasting off at the speed of light, surrender now or prepare to fight!