In the Pokemon Fire Red version, Rock Smash can be obtained in two ways. The first and easiest method is to have your Pokemon use the move Headbutt on a rock. In most cases, the rock will break apart, revealing a hidden item. In this case, the item will be Rock Smash. The second way to obtain Rock Smash is to defeat the trainer, Brock, at the Pewter City Gym. Once you have obtained Rock Smash, it can be used to break apart rocks that are blocking your path or to damage your opponents in battle.
Rock Smash is an important move to have in Pokemon Fire Red. It can be used to clear a path through the many caves and tunnels in the game, and it can also be used to defeat certain types of Pokemon that are weak to Rock-type moves. Rock Smash is a powerful move that can be a valuable asset to any Pokemon trainer.