The only way to learn Thyplosion Flare Blitz is by breeding.
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Infernape learns Flare Blitz at level 57.
level 56
I'm 99.999999999...% positive that charizard learns flare blitz at level 66.
Charizard can't learn flare blitz because its not a move, maybe your talking about Blast burn it needs to be level 50 to learn it then go to two island and go north to a house go in and talk to the lady show her your charizard and she will teach it blast burn.
It learns seed flare at level 100 . Hope this helped!