Once you've defeated every gym leader, talk to Proffesor Oak in Pallet town. He will give you HM08 ROCK CLIMB.
have a Pokemon who knows rock climb and rock smash
You need to have the move rock climb
South From where the the first gym is!
Onix and Geodude are two I know.
In the hot spring
Rock climb
First you have to beat all the Kanto Gym leaders. Then you must go see Professor Oak at his lab in Pallet Town. I hope this helped.
Professor Oak gives you it after you get 16 badges
Graveler evolves when you tade it :)
right next to the place you find soodowoodo
you use rock climb
in soul silver