(in Diamond,Pearl, Platinum) The 7th gym leader which is in Snowpoint City her name is Candice and she's a user of ice type Pokemon she uses a lv40 Sneasel, lv40 Medicham, lv44 Froslass and a Abomasnow lv42 in that order I think.
In HeartGold and SoulSilver you beat all the gym leaders
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After you beat Blue, the 16th gym leader
It is only usable after you beat all 16 gyms.
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.
you use the move rock climb, but u have to beat the gym leader candice
You have to beat the elite four then go to Kanto and beat all of their gyms to use rock climb.