Diancie-Mega @ Pixie Plate  
Ability: Pixilate  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Extreme Speed  
- Boomburst  
- U-turn  
- V-create  

Gyarados-Mega (M) @ Choice Band  
Ability: Tough Claws  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 68 Spe  
Brave Nature  
IVs: 0 Spe  
- Knock Off  
- Pursuit  
- Switcheroo  
- U-turn  

Giratina @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 172 Spe  
Relaxed Nature  
IVs: 0 Spe  
- Core Enforcer  
- U-turn  
- Roost  
- Defog  

Chansey @ Eviolite  
Ability: Imposter  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Anchor Shot  
- Defog  
- Metal Burst  
- Milk Drink  

Arceus @ Toxic Plate  
Ability: Multitype  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Stealth Rock  
- Soft-Boiled  
- Topsy-Turvy  

Registeel @ Safety Goggles  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Haze  
- Destiny Bond  
- Roost  
- U-turn