Mewtwo-Mega-Y @ Focus Sash  
Ability: Protean  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Shell Smash  
- Moongeist Beam  
- Freeze-Dry  
- Sunsteel Strike