Miraidon @ Choice Specs  
Ability: Hadron Engine  
Tera Type: Dragon / Electric  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Rising Voltage  
- Dragon Energy  
- Draco Meteor  
- U-turn  

Mewtwo-Mega-X @ Choice Band / Life Orb 
Ability: Adaptability  
Tera Type: Psychic  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Jolly / Naive Nature  
- Photon Geyser  
- Close Combat  
- Glacial Lance / Strength Sap  
- U-Turn / Astral Barrage