Well, it really depends on what you need for the team. Emboar is Physical, while Charizard is Special.
Emboar (M) @ Choice Scarf
Trait: Blaze
EVs: 252 Atk / 4 Def / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Flare Blitz
- Wild Charge
- Superpower
- Earthquake
Charizard (F) @ Choice Specs
Trait: Solar Power
EVs: 4 Def / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Fire Blast
- Air Slash
- Hidden Power [Grass]
- Focus Blast