u need strenght after u smash a rock for the guy who wants to see his girlfriend every day he will give u srenght but u need a gym badge i don't remember what badge
When you smash the rock Granite cave, a person gives it to you.
Actually, you can't get HM Rock Climb on Pokemon Ruby, its only available in Pokemon Diamond, Pearl and Platinum.
at a town
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Just search warp for pokemon ruby on google
You have to use a HM called strengh.
Regirock
You can use any Pokemon that is able to learn Strength to push rocks.
you can find the legendary Pokemon regirock
Get the HM Rock Smash
in a house in mauville city
rock throw