To get rock climb in HG/SS you have to beat Blue's Pokemon gym in Veridian City first. Then, go talk to Professor Oak. He will give you the HM rock climb.
Note: If you trade a Pokemon from D/P/P , even if you taught it rock climb, you cant use it until you beat Varidian gym.
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come back to cinnibar island with a Pokemon with rock climb n climb the rock until u find it
You'll get Rock Climb from Prof. Oak when you have defeated all the Gym leaders in the Kanto region. Prof. Oak is at the laboratory in Pallet Town.
You're talking about HM 08 Rock Climb. You get Rock Climb when you get all 8 Kanto Badges. After this, Professor Oak gives this HM to you.
Surf west of Cherrygrove, use rock climb and headbutt the trees. Catch it.
You need Hm Rock Climb, you need to obtain all 16 gym badges.