Eternatus @ Power Herb / Life Orb
Ability: Pressure  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid / Modest Nature  
IVs: 0 Atk  
- Meteor Beam / Sludge Bomb
- Dynamax Cannon  
- Flamethrower  
- Recover  

Blissey (F) @ Utility Umbrella / Heavy-Duty Boots
Ability: Natural Cure  
EVs: 4 HP / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Thunder Wave / Toxic / Seismic Toss
- Aromatherapy  
- Soft-Boiled  
- Teleport / Confide