Mr. Mime @ Choice Scarf or Choice Specs 
Ability: Filter  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psychic  
- Dazzling Gleam  
- Focus Blast / Shadow Ball  
- Healing Wish / Trick

Mr. Mime @ Life Orb or Heavy Duty Boots
Ability: Filter  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Nasty Plot  
- Psychic  
- Dazzling Gleam  
- Focus Blast / Shadow Ball