Talk to Professor Oak after obtaining all 16 badges.
have a Pokemon who knows rock climb and rock smash
Rock climb
You need to have the move rock climb
you use rock climb
Professor Oak gives you it after you get 16 badges
After obtaining all of the kanto and johto badges visit professer Oak and he will give you the HM rock climb.
every where in the jonto region but rock climb is in the kanto region
You can now rock climb and do a whole lot more
if you want it from soul silver or heart gold you get it professor chen in kanto
You get rock climb at the one of the gyms
you can find it in cerulean cave in the northeast corner of b1fyou to have a pokemon that knows rock climb
Hes on top of the cave just west of the Pokemon league gotta have strenght rock smash and rock climb