You can't, you won't need it to finish the game either
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Rock Smash is TM08 in Gold and Silver, is a newer move and therefore is not usable or findable in Pokemon Red, Blue or Yellow.
in Pokemon silver, gold, crystal, yellow, blue or red rock smash don't exist. in the new versions rock smash is a HM.
rock smash isn't in Pokemon red version
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.
no Pokemon can learn rock smash by leveling up you have to get the hm.