Whimsicott @ Focus Sash  
Ability: Prankster  
Level: 50  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Moonblast  
- Tailwind  
- Helping Hand  
- Protect

Unown
Options:
- offensive: Dazzling Gleam, Energy Ball
- supportive: Encore, Fake Tears, Taunt, Beat Up
- items: Mental Herb

Unown
Offensive calcs:
- 252 SpA Whimsicott Moonblast vs. 0 HP / 4 SpD Urshifu-Rapid Strike: 170-204 (97.1 - 116.5%) -- 87.5% chance to OHKO

Unown
Useful partners:
- hard hitting attackers: Mega Luxray, Dracovish, Terrakion, Landorus-T, Spectrier