It doesn't. Flare Blitz is a move only fire-type starter Pokemon can learn.
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you cant get that move in that game
I'm 99.999999999...% positive that charizard learns flare blitz at level 66.
flare blitz is not a TM
As far as I know, the move Flare Blitz is not a TM and thus cannot be purchased or found in the field. It is instead learned by select Fire-type Pokemon via a level-up. Two such Pokemon are Infernape and Rapidash.
Infernape learns Flare Blitz at level 57.