Latios-Mega (M) @ Soul Dew  
Ability: Mold Breaker  
EVs: 48 HP / 252 SpA / 4 SpD / 204 Spe  
Modest Nature  
IVs: 0 Atk  
- Quiver Dance  
- Spore  
- Spacial Rend  
- Psystrike  

Mewtwo-Mega-X @ Choice Band  
Ability: Arena Trap  
EVs: 60 Atk / 208 Def / 4 SpA / 236 Spe  
Naive Nature  
- Dragon Ascent  
- Steam Eruption  
- Close Combat  
- Knock Off  

Groudon-Primal @ Choice Band  
Ability: Mold Breaker  
EVs: 248 HP / 252 Atk / 8 Def  
Adamant Nature  
- V-create  
- Thousand Arrows  
- Trick  
- U-turn  

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 116 HP / 8 Def / 252 SpA / 32 SpD / 100 Spe  
Modest Nature  
IVs: 0 Atk  
- Moonblast  
- Substitute  
- Baton Pass  
- Taunt  

Slaking @ Silk Scarf  
Ability: Shadow Tag  
EVs: 4 HP / 252 Atk / 252 Def  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Recover  
- Encore  

Ferrothorn @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 168 Def / 92 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Roost  
- Defog  
- Baton Pass  
- Whirlwind