Gastly @ Life Orb or Choice Scarf 
Ability: Levitate  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sludge Bomb / Sludge Wave
- Shadow Ball  
- Dazzling Gleam
- Thunderbolt / Trick