Swords Dance (Charizard-Mega-X) @ Charizardite X  
Ability: Tough Claws  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Swords Dance  
- Flare Blitz  
- Dragon Claw  
- Roost

Alternate set (Charizard-Mega-X) @ Charizardite X  
Ability: Tough Claws  
EVs: 248 HP / 8 Atk / 68 Def / 12 SpD / 172 Spe  
Adamant Nature  
- Swords Dance  
- Flare Blitz  
- Dragon Claw  
- Roost