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Deals damage and has a 30% chance to burn the target.
Fire Blast is a reasonably strong offensive option for Pokemon requiring power and good coverage in one move. Unlike other moves with a Base Power of 120, most of which have even lower accuracy, Fire Blast also has an adequate 85% chance of hitting the opponent, which is a fair trade-off considering Flamethrower, another similar move, has perfect accuracy yet less power. It also has a nice 30% burn chance, meaning you are going to cripple physical attackers often. However, Fire-types are not that good in RBY, the best one available being Moltres, who is UU, so the move is not seen much anyways.
Flamethrower is a reliable alternative with 95 Base Power, 100% accuracy, and a 10% chance to burn.