Charizard shoots a stream of flames from its mouth, which can be directed up or down by tilting the control stick in a particular direction. The flames die down the longer the button is held, but they will never stop; however, they will become extremely small.
As Charizard's down throw
Charizard also uses Flamethrower in its down throw: Charizard throws its opponent to the ground, and then burns them with Flamethrower. It has mainly horizontal knockback, and it cannot be reflected, even by a Franklin Badge.
In SSB4, prior to patch 1.0.8, down throw could KO at higher levels of damage, but could be DI'd out of. Following the patch, however, it is now a combo throw, following up into a forward aerial until around 60%, and Charizard's up throw is now its KO throw. This inflicts a total of 6% damage.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
As Charizard's attack as a Poké Ball
Use by other Pokémon
There are also Pokémon other than Charizard that have used Flamethrower within the Smash series:
Flamethrower is a special Fire-type attack introduced in Generation I, with high power and a small chance to burn the opponent. It involves the user shooting a stream of fire, usually from its mouth, at the opponent.
Fire Fang, one of this move's custom variations, is a physical Fire-type attack introduced in Generation IV. It involves the user biting the opponent with fiery fangs and, while not very powerful, it has a small chance to burn the opponent and/or make it flinch.
In the Pokémon games, both moves can be learned by Charizard by simply leveling up in all games since their respective introduction.