Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 252 HP / 4 Atk / 252 Def  
Relaxed Nature  
IVs: 0 Spe  
- Transform  

Gastrodon @ Heavy-Duty Boots  
Ability: Sticky Hold  
EVs: 252 HP / 4 Def / 252 SpD  
Sassy Nature  
- Scald  
- Earthquake  
- Recover  
- Clear Smog