It's in Rustboro City, there's a cutter's house or something on the left side of the city. Talk to the cutter and get cut.
In Third Generation Whirlpool is no longer an HM.
In the Cave of Origin.
up your rump
it isn't in Pokemon platinum its in ruby and Sapphire
You get the hm strength and give it to one of your pokemon
Get the HM Rock Smash
in the cave of origin
in the cave of orgin
Use the hm surf
Actually, you can't get HM Rock Climb on Pokemon Ruby, its only available in Pokemon Diamond, Pearl and Platinum.
You have to use a HM called strengh.
It's on route 119. You get it from your rival.