Rock Climb can be taught to certain Pokemon from the Egg Move Tutors. It is used to pass certain terrain types in the world of PokeOne.
A list of Pokemon that can learn Rock Climb: Geodude, Graveler, Golem, Onix, Steelix, Sandshrew, Sandlash.
There are probably more and I will list them as I can.
Similar Terms: Rockclimb