Gengar-Mega @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Moongeist Beam / Zap Cannon / Entrainment / Menacing Moonraze Maelstrom  
- Toxic Spikes / Stealth Rock / Spikes
- Fissure / Sheer Cold  
- Sing / Taunt / Lovely Kiss  

Gengar-Mega @ Choice Scarf  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk / 31 Atk 
- Moongeist Beam / Entrainment / Sing  
- Fissure / Sheer Cold
- Trick / U-turn / Parting Shot / Baton Pass
- Toxic Spikes / Spikes / Entrainment / Sing  

Gengar-Mega @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Shell Smash  
- Moongeist Beam  
- Fissure / Sheer Cold  
- Sing / Taunt