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Tm. 35
TM35.
the only way i know to get flamethrower in emerald is in mauville city in the game corner you will need 80000$ to get it or 4000 coins good luck by????? in the fire place with teem magma
thunderbolt, psychic, double team, flamethrower... if you select it, the lady will say what it is
rapidash learns flamethrower if you get the TM flamethrower and teach it