To get Rock Climb, you should have all 16 badges and when you step out Blue's Gym (16th Gym Leader), Prof. Oak will call and will tell you to go to him and when go to his lab, he will give Rock Climb.
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you get it AFTER you beat blue
You can get Rock Climb from Professor Oak after you've beaten all 16 Gym Leaders.
you get it from oak after beating blue
Beat Blue and go to Professor Oak in Pallet Town. He gives HM 08- Rock Climb to you.
rock climb