Mareanie @ Eviolite 
Ability: Regenerator 
EVs: 248 HP / 252 Def / 8 SpD 
Bold Nature 
IVs: 0 Atk 
- Scald 
- Toxic Spikes 
- Recover 
- Haze 

Duosion @ Eviolite 
Ability: Magic Guard 
EVs: 252 HP / 252 Def / 4 SpA 
Bold Nature 
- Calm Mind 
- Psychic 
- Acid Armor 
- Recover 

OR 

Vigoroth @ Eviolite 
Ability: Vital Spirit 
EVs: 252 HP / 164 SpD / 92 Spe 
Jolly Nature 
- Substitute 
- Bulk Up 
- Slack Off 
- Return