Volcarona @ Heavy-Duty Boots  
Ability: Flame Body  
Tera Type: Grass
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Quiver Dance  
- Flamethrower  
- Bug Buzz / Psychic 
- Giga Drain

Gyarados-Mega @ Gyaradosite  
Ability: Mold Breaker  
Tera Type: Water  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Waterfall  
- Crunch  
- Substitute / Earthquake / Taunt