Defeat the first Gym Leader.The Gym Leader is going to give you the Rock Smash attack.
Teach a Pokemon the attack.
Then you can break cracked rocks.
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you need rock smash. go up the set of stairs then go to the right. use rock smash on the rock. you get rock smash after beating the oreburgh gym leader
it cant, use a hm to make him learn it!
A wide variety of Pokemon can use Rock Smash. Most Fighting, Rock and Ground type Pokemon can learn the move Rock Smash from the TM or HM depending on the Pokemon version.
You teach a Pokemon rock smash then go to jubilfe city! once there go straight up and there should be a cave go in cave turn left and use rock smash!
In this game, rock smash is not an HM, it is a TM.