Groudon-Primal @ Mental Herb  
Ability: Mold Breaker  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Belly Drum  
- Thousand Arrows  
- Extreme Speed  
- Ice Shard  

Gengar-Mega @ Black Sludge  
Ability: No Guard  
EVs: 248 HP / 8 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sheer Cold  
- Dark Void  
- Substitute  
- Baton Pass  

Rayquaza-Mega @ Sky Plate  
Ability: Gale Wings  
EVs: 252 HP / 252 SpA / 4 Spe  
Modest Nature  
IVs: 0 Atk  
- Chatter  
- Oblivion Wing  
- Taunt  
- Baton Pass  

Swampert-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Parting Shot  
- Defog  
- Aromatherapy  
- Recover  

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Moonblast  
- Chatter  
- Baton Pass  

Giratina @ Leftovers  
Ability: Prankster  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Destiny Bond  
- Encore  
- Curse  
- Roost