Gastly @ Eviolite  
Ability: Levitate  
Level: 5  
EVs: 116 HP / 36 Def / 116 SpA / 196 Spe  
Timid Nature  
- Will-O-Wisp  
- Substitute  
- Shadow Ball  
- Knock Off  

Gastly @ Black Sludge  
Ability: Levitate  
Level: 5  
EVs: 116 HP / 36 Def / 116 SpA / 196 Spe  
Timid Nature  
IVs: 0 Atk  
- Trick  
- Pain Split  
- Will-O-Wisp  
- Sludge Bomb  

Gastly @ Life Orb  
Ability: Levitate  
Level: 5  
EVs: 76 Atk / 36 Def / 196 SpA / 196 Spe  
Naive Nature  
- Sludge Bomb  
- Shadow Ball  
- Sucker Punch  
- Substitute  

Gastly @ Choice Scarf  
Ability: Levitate  
Level: 5  
EVs: 200 SpA / 76 SpD / 200 Spe  
Timid Nature  
IVs: 2 Atk / 30 SpA / 30 Spe  
- Shadow Ball  
- Sludge Bomb  
- Hidden Power [Fire]  
- Trick  

I have a reason to exist (Gastly) @ Eviolite  
Ability: Levitate  
Level: 5  
EVs: 116 HP / 36 Def / 116 SpA / 196 Spe  
Timid Nature  
IVs: 0 Atk  
- Torment  
- Substitute  
- Pain Split  
- Sludge Bomb