Mewtwo-Mega-Y @ Mind Plate  
Ability: Teravolt  
Tera Type: Psychic  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psystrike  
- Torch Song  
- Strength Sap  
- Spikes  

Latias-Mega (F) @ Covert Cloak  
Ability: Levitate  
Tera Type: Dragon  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Roost  
- Revelation Dance  
- Earth Power  
- Mortal Spin  

Chansey (F) @ Eviolite  
Ability: Imposter  
Tera Type: Normal  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Roost  
- Ruination  
- Mortal Spin  
- Block  

Diancie-Mega @ Choice Specs  
Ability: Pixilate  
Tera Type: Rock  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 Spe  
Naive Nature  
IVs: 0 SpD  
- Volt Switch  
- Extreme Speed  
- Boomburst  
- Revelation Dance  

Steelix-Mega @ Assault Vest  
Ability: Regenerator  
Tera Type: Steel  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Knock Off  
- Gigaton Hammer  
- Stone Axe  
- U-turn  

Arceus-Poison @ Earth Plate  
Ability: Fur Coat  
Tera Type: Poison  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Strength Sap  
- Mortal Spin  
- Judgment  
- Take Heart