Whimsicott @ Leftovers  
Ability: Prankster  
EVs: 248 HP / 8 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Spore  
- Substitute  
- Minimize  
- Baton Pass  

Xerneas @ Iron Plate  
Ability: Wonder Guard  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Judgment  
- Lava Plume  
- Freeze-Dry  

Mawile-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 252 Atk / 8 Def  
Brave Nature  
IVs: 0 Spe  
- Play Rough  
- U-turn  
- Recover  
- Stealth Rock  

Diancie-Mega @ Pixie Plate  
Ability: Pixilate  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Fake Out  
- Extreme Speed  
- Thousand Arrows  
- Toxic Spikes  

Wigglytuff @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 8 Def / 252 Spe  
Timid Nature  
- Fake Out  
- Recover  
- Whirlwind  
- Parting Shot  

Diancie-Mega @ Focus Sash  
Ability: Mold Breaker  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Shell Smash  
- Moonblast  
- Power Gem  
- Earth Power