So, I originally wasn't gonna post this team, but I lost a bet in the OU room, so lucky you guys I guess?
Paper Shredder
(sorry the title font isn't very fancy, please understand)
The core:
Prom Queen (Diancie-Mega) @ Diancite
Ability: Clear Body
EVs: 32 Atk / 224 SpA / 252 Spe
Naive...