Rock Smash is a move that allows you to break rocks and access hidden areas. While some Pokémon might appear in those hidden areas, they can also be found in other locations without using Rock Smash.
However, there are Pokémon that are more likely to be found in areas where Rock Smash is useful. For example:
* Geodude: While not exclusive to Rock Smash areas, Geodude is commonly found in areas with rocks and can be found by using Rock Smash to break them.
* Onix: Similar to Geodude, Onix can be found in areas with rocks, and Rock Smash can help access these areas.
* Nosepass: Nosepass is often found in areas with large rocks and mountains, areas where Rock Smash is helpful.
Keep in mind that these are just examples, and the specific Pokémon you encounter will vary depending on the game and the region you're playing in.