Koffing @ Leftovers  
Ability: Levitate  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Will-O-Wisp  
- Sludge Bomb  
- Pain Split  
- Haze
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Optional Move(s): 
- Destiny Bond
- Explosion
- Flamethrower
- Memento
Optional Item(s): 
- N/A
Optional Ability:  
- N/A
Optional EV/IV(s): 
- 252 HP / 252 Def / 4 SpD (Bold)