Slaking @ Leftovers  
Ability: Shadow Tag  
EVs: 252 Atk / 252 Def / 4 SpD  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Encore  
- Spikes  

Rayquaza-Mega @ Sky Plate  
Ability: Mold Breaker  
EVs: 92 Def / 252 SpA / 164 Spe  
Modest Nature  
IVs: 0 Atk  
- Dark Void  
- Substitute  
- Shell Smash  
- Oblivion Wing  

Gyarados-Mega @ Lum Berry  
Ability: Huge Power  
EVs: 248 HP / 252 Atk / 8 Spe  
Adamant Nature  
- Water Shuriken  
- Pursuit  
- Sucker Punch  
- Beat Up  

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 248 HP / 8 Def / 252 SpA  
Modest Nature  
IVs: 0 Atk / 0 Spe  
- Substitute  
- Baton Pass  
- Moonblast  
- Stealth Rock  

Giratina @ Safety Goggles  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Encore  
- Recover  
- Curse  
- Spore  

Blissey @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 252 SpD / 4 Spe  
Calm Nature  
IVs: 0 Atk  
- Aromatherapy  
- Recover  
- Defog  
- Chatter