Mewtwo-Mega-Y @ Life Orb  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Focus Blast  
- Blizzard  
- Psystrike  
- Magma Storm  

Giratina @ Leftovers  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Haze  
- Milk Drink  
- Core Enforcer  
- Stealth Rock  

Diancie-Mega @ Groundium Z  
Ability: Pixilate  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Extreme Speed  
- Boomburst  
- Diamond Storm  
- Precipice Blades  

Celesteela @ Leftovers  
Ability: Flash Fire  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Beak Blast  
- Anchor Shot  
- Roost  
- Entrainment  

Muk-Alola @ Black Sludge  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Poison Fang  
- Knock Off  
- Shore Up  
- Defog  

Chansey @ Eviolite  
Ability: Imposter  
Happiness: 55  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Shore Up  
- Topsy-Turvy  
- U-turn  
- Whirlwind