Diancie-Mega @ Groundium Z  
Ability: Pixilate  
Tera Type: Rock  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Boomburst  
- Extreme Speed  
- Precipice Blades  
- Volt Switch  

Steelix-Mega @ Assault Vest  
Ability: Regenerator  
Tera Type: Steel  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- U-turn  
- Gigaton Hammer  
- Ceaseless Edge  
- Rapid Spin  

Mewtwo-Mega-Y @ Life Orb  
Ability: Magic Guard  
Tera Type: Psychic  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naive Nature  
- High Jump Kick  
- Mind Blown  
- Lumina Crash  
- Light of Ruin  

Arceus-Water @ Covert Cloak  
Ability: Fur Coat  
Tera Type: Water  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Scald  
- Worry Seed  
- Teleport  
- Heal Order  

Kyogre-Primal @ Covert Cloak  
Ability: Ice Scales  
Tera Type: Water  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Scald  
- Volt Switch  
- Heal Order  
- Spectral Thief  

Zygarde-Complete @ Toxic Orb  
Ability: Poison Heal  
Tera Type: Dragon  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Core Enforcer  
- Parting Shot  
- Burning Bulwark  
- Spectral Thief