Deoxys-Attack @ Fairium Z  
Ability: Neuroforce  
EVs: 252 HP / 252 Atk / 252 SpA / 252 Spe  
Hasty Nature  
IVs: 0 Def / 0 SpD  
- Fleur Cannon  
- U-turn  
- Sunsteel Strike  
- V-create  

Mewtwo @ Enigma Berry  
Ability: Mold Breaker  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Imprison  
- Defog  
- Spikes  
- Explosion  

Diancie-Mega @ Pixie Plate  
Ability: Pixilate  
EVs: 252 HP / 252 Atk / 252 SpD / 252 Spe  
Hasty Nature  
IVs: 0 Def  
- Extreme Speed  
- Rapid Spin  
- Explosion  
- V-create  

Gengar-Mega @ Spooky Plate  
Ability: Dazzling  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Ice Beam  
- Quiver Dance  
- Substitute  

Xerneas @ Fairium Z  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Taunt  
- Moonblast  
- Haze  
- Strength Sap  

Muk-Alola @ Assault Vest  
Ability: Regenerator  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Nuzzle  
- U-turn  
- Knock Off  
- Nature's Madness