Gengar @ Life Orb  
Ability: Sheer Force  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Shadow Ball  
- Sludge Wave  
- Focus Blast  
- Nasty Plot / Knock Off

Gengar @ Life Orb / Focus Sash
Ability: No Guard  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Zap Cannon  
- Hypnosis / Nasty Plot
- Hex  
- Focus Blast / Nasty Plot

Gengar @ Leftovers  
Ability: Normalize  
EVs: 252 HP / 4 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Infestation  
- Skill Swap  
- Perish Song  
- Encore