Corviknight @ Leftovers  
Ability: Volt Absorb  
EVs: 248 HP / 8 Def / 252 SpD  
Calm Nature  
- Iron Head  
- U-turn  
- Roost  
- Defog  

Blissey @ Eject Button  
Ability: Regenerator  
EVs: 252 HP / 252 Def / 4 SpA  
Bold Nature  
IVs: 0 Atk  
- Seismic Toss  
- Heal Bell  
- Stealth Rock  
- Teleport  

Terrakion @ Choice Band  
Ability: Tinted Lens  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Stone Edge  
- Close Combat  
- Earthquake  
- Toxic  

Toxapex @ Black Sludge  
Ability: Prankster  
EVs: 252 HP / 148 Def / 108 SpD  
Calm Nature  
- Scald  
- Knock Off  
- Haze  
- Recover  

Mew @ Heavy-Duty Boots  
Ability: Dauntless Shield  
EVs: 252 HP / 240 Def / 16 Spe  
Bold Nature  
IVs: 0 Atk  
- Ice Beam  
- Volt Switch  
- Spikes  
- Roost  

Latias (F) @ Leftovers  
Ability: Magic Bounce  
EVs: 252 HP / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psyshock  
- Ice Beam  
- Recover  
- Calm Mind