Well in Pokemon Black and White its no longer a HM its now just a TM if its not working in battle your game is messed up
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In this game, rock smash is not an HM, it is a TM.
Rock Smash is not a HM, it's a TM. You can get it from a Battle Girl outside Pinwheel Forest
rock smash isn't in Pokemon red version
You can't. for some reason they did make rock smash an HM in gen 5.
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.