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Deals damage and has a 10% chance to burn the target.
Fire Punch is a special attack in RBY and its users normally lack STAB, so unless you are using it on a tradeback Alakazam to cover Exeggutor better, you won't use this move.
Flamethrower is a stronger alternative with 95 Base Power and 100% accuracy.
Fire Blast is a stronger alternative with 120 Base Power and 30% chance to burn, albeit less accuracy.