Rock Climb isn't a move in the game. It wasn't introduced until the 4th generation games (Diamond/Pearl/Platinum).
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You Can't Get The HM Rock Climb In Pokemon Emerald Because Its Only Availible In Pokemon Diamond,Pearl,And Platinum.
You can't, you need the HM CUT.
Get the waterfall hm!
Rock Climb doesn't exist in Sapphire. It actually exist in Emerald so trade a Pokemon from Emerald to Sapphire that has rock climb!
Teach them the HM move Rock Climb