Rayquaza-Mega @ Mental Herb  
Ability: Teravolt  
EVs: 88 Def / 252 SpA / 168 Spe  
Modest Nature  
IVs: 0 Atk  
- Dark Void  
- Shell Smash  
- Oblivion Wing  
- Substitute  

Diancie-Mega @ Shed Shell  
Ability: Pixilate  
EVs: 248 HP / 252 Atk / 8 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Spore  
- Stealth Rock  

Ludicolo @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Aromatherapy  
- Defog  
- Recover  
- Scald  

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 96 HP / 20 Def / 252 SpA / 140 Spe  
Modest Nature  
IVs: 0 Atk  
- Substitute  
- Taunt  
- Moonblast  
- Baton Pass  

Giratina @ Leftovers  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Curse  
- Encore  
- Topsy-Turvy  
- Milk Drink  

Mewtwo-Mega-X @ Choice Scarf  
Ability: Shadow Tag  
EVs: 200 Atk / 88 Def / 220 Spe  
Adamant Nature  
- Storm Throw  
- Petal Blizzard  
- Trick  
- Beat Up