As of Pokemon Black 2 and White 2, Charizard learns...
[Start] Dragon Claw
[Start] Shadow Claw
[Start] Air Slash
[Start] Scratch
[Start] Growl
[Start] Ember
[Start] SmokeScreen
[Level 7] Ember
[Level 10] SmokeScreen
[Level 17] Dragon Rage
[Level 21] Scary Face
[Level 28] Fire Fang
[Level 32] Flame Burst
[Level 36] Wing Attack
[Level 41] Slash
[Level 47] Flamethrower
[Level 56] Fire Spin
[Level 62] Inferno
[Level 71] Heat Wave
[Level 77] Flare Blitz
OP6
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Entei, because he is a legendary Pokemon and he can learn much better moves but on the other hand Charizard because he can use fly
No, Charizard is not able to learn Thunder.
Charizard can learn TM50- Overheat.
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.
Charizard can't learn flame wheel