It learns Flamethrower at level 34.
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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.
at level 34 35 or 36
It takes a long time. You can either teach it a TM move flamethrower, breed a charmander, charmeleon or charizard with another Pokemon from the same group as it which knows flamethrower, or level up charmander to lv 32.
You only can learn flamethrower if you have a fire-type pokemon. Look for TM35.
Houndoom learns Flamethrower at lvl 48.