If you mean Rock Climb, Rock Climb can be found on the way to Snowpoint City. Try to find a house in the route in which there is a huge blizzard. It is easy to miss the house, so try to comb the area thoroughly. You can find the HM behind the house.
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you use it for the move maniac who reteaches your Pokemon a moves for one heart scale
It is at the top of the lost tower. An old lady will giv it to you.
Catch or use the move Thief on a wild Horsea or Seadra. There is a 5% chance that they will be holding a dragon scale.
you use the move rock climb, but u have to beat the gym leader candice
In a house in Pastoria City, a Move Tutor will teach your Pokemon a move of your choise. In return he will ask for a Heart Scale, which can be found in the Sinnoh Underground.