The HM06 which contains Rock Smash is given by an old man on One Island in the ember spa.
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Rock Smash can be found on Island 1, in the little spa area on Kindle Road.
You use rock smash and can sometimes find fossils.
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.
You can find it right next to the pokemart in mauville city talk to the guy in the house and he will give you HM rock smash