By Leveling Up:
* Machop: Learns Rock Smash at level 1
* Machoke: Learns Rock Smash at level 1
* Machamp: Learns Rock Smash at level 1
* Rhyhorn: Learns Rock Smash at level 1
* Rhydon: Learns Rock Smash at level 1
* Rhyperior: Learns Rock Smash at level 1
* Geodude: Learns Rock Smash at level 1
* Graveler: Learns Rock Smash at level 1
* Golem: Learns Rock Smash at level 1
* Onix: Learns Rock Smash at level 1
* Steelix: Learns Rock Smash at level 1
* Larvitar: Learns Rock Smash at level 1
* Pupitar: Learns Rock Smash at level 1
* Tyranitar: Learns Rock Smash at level 1
* Gible: Learns Rock Smash at level 1
* Gabite: Learns Rock Smash at level 1
* Garchomp: Learns Rock Smash at level 1
* Rockruff: Learns Rock Smash at level 1
* Lycanroc (Midday Form): Learns Rock Smash at level 1
* Lycanroc (Midnight Form): Learns Rock Smash at level 1
* Lycanroc (Dusk Form): Learns Rock Smash at level 1
By TM:
* Any Pokémon that can learn TM79
By Breeding:
* Any Pokémon that can breed with a Pokémon that knows Rock Smash
Note:
* Rock Smash is a move that is used to break rocks in the game to reveal hidden items or paths.
* The availability of moves can vary depending on the specific game.
* Some Pokémon may learn Rock Smash through other means, such as specific events or in-game tutorials.
This list covers most of the main series games. However, some remakes and spin-offs might have different availability of Rock Smash.