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My Charizard knows
Flamethrower
FLY
Slash (that critical hit really comes in handy)
Fire Spin
A strategy I like to use, Fire Spin to keep your opponent's Pokémon pinned, then keep using FLY while they get burned and miss their attacks. Flamethrower/Slash are finishing moves.
Works really effective and my Charizard has never let me down.