Blissey (F) @ Heavy-Duty Boots / Leftovers
Ability: Unaware / Regenerator / Magic Bounce 
EVs: 4 HP / 252 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Teleport  
- Soft-Boiled  
- Seismic Toss  
- Toxic / Thunder Wave / Counter / Stealth Rock