In Pokémon LeafGreen, the moves that Charizard can learn would include Flamethrower, Fire Spin, Fire Blast, Ember, Growl, Scratch, Scary Face, Smokescreen, Wing Attack, Dragon Rage, Slash, Heat Wave, Metal Claw, Sunny Day, Toxic, Roar, Focus Punch, Dragon Claw, Hidden Power, Return, Frustration, Protect, Hyper Beam, Iron Tail, Earthquake, Dig, Brick Break, Double Team, Facade, Secret Power, Aerial Ace, Attract, Rest, Overheat and Steel Wing.
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Charizard can't learn flame wheel
In leaf green, you can learn flamethrower somewhere between levels 35 through 40. You can do this with a charmeleon/charizard. I'm not sure about other pokemon, though.
A typlosion can learn explsion
You can't. The only move tutor who teaches Seismic Toss is in FireRed and LeafGreen. Unless you had it there, then migrated it all the way up, your charizard can't learn it. But it shouldn't learn it, Charizard has better moves like Air Slash and Flamethrower. Teach it those. Not having Seismic Toss is not a loss to Charizard. Charizard is actually not that good with his Stealth Rock weakness though.
Use HM2 to teach charizard fly.