Lead Gastly

Gastly @ Focus Sash  
Ability: Levitate  
Level: 5  
EVs: 80 Atk / 196 SpA / 196 Spe  
Hasty Nature  
- Sludge Bomb  
- Shadow Ball  
- Sucker Punch  
- Hidden Power [Ice] / Explosion

Sub Oran Gastly

Gastly @ Oran Berry  
Ability: Levitate  
Level: 5  
EVs: 116 Def / 196 SpA / 196 Spe  
Timid Nature  
IVs: 0 Atk  
- Sludge Bomb 
- Shadow Ball / Hidden Power [Ice]
- Substitute  
- Hidden Power [Ground] / Will-o-Wisp / Explosion / Sucker Punch 

Life Orb Gastly
Gastly @ Life Orb  
Ability: Levitate  
Level: 5  
EVs: 200 SpA / 80 SpD / 196 Spe  
Timid Nature   
- Sludge Bomb  
- Shadow Ball  
- Substitute / Sucker Punch 
- Hidden Power [Ground] 

Scarf Gastly

Gastly @ Choice Scarf  
Ability: Levitate  
Level: 5  
EVs: 36 HP / 36 Def / 200 SpA / 196 Spe  
Timid Nature  
IVs: 3 Atk / 30 SpA / 30 SpD  
- Sludge Bomb  
- Shadow Ball  
- Hidden Power [Ground] / Hidden Power [Fighting]
- Trick / Explosion