Diancie-Mega @ Expert Belt  
Ability: Pixilate  
EVs: 252 Atk / 4 SpA / 252 Spe  
Naughty Nature  
- Fake Out  
- Extreme Speed  
- Freeze-Dry  
- Stealth Rock  

Venusaur-Mega @ Shed Shell  
Ability: Magic Bounce  
EVs: 248 HP / 8 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Parting Shot  
- Recover  
- Toxic  
- Knock Off  

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

Arceus @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 44 Def / 216 Spe  
Timid Nature  
IVs: 0 Atk  
- Volt Switch  
- Gastro Acid  
- Recover  
- Defog  

Gyarados @ Gyaradosite  
Ability: Wonder Guard  
EVs: 32 HP / 252 Atk / 224 Spe  
Adamant Nature  
- Shell Smash  
- Waterfall  
- Knock Off  
- Taunt  

Mewtwo-Mega-X @ Choice Band  
Ability: Shadow Tag  
EVs: 248 Atk / 8 SpD / 252 Spe  
Jolly Nature  
- Shadow Sneak  
- Knock Off  
- Switcheroo  
- Gunk Shot