After you battle Sudowoodo, the man near the ruins of alpha entrance will thank you and give you rock smash.
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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
Go to where you caught/battled Sudowoodo, and to the right, there's a fatty who gives it to you!
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.
Pokemon Crystal only contained seven HMs. The 8th HM Rock smash isn't available until later generation games. The HM one can get in Pokemon Crystal are cut, fly, whirlpool, waterfall, strength, flash, and surf.