you can find it in your bag where all your tms are.All the hms like rockclimb are under the tms.You can find hm rockclimb before you enter snowpoint city and after you get out of mount cornet it's in between there.
you use the move rock climb, but u have to beat the gym leader candice
The 7th Gym Leader Candice (Snowpoint City)
You need the HM rock climb to enter lake acuity. But you can't use that HM until you defeat the gym leader Candice in snowpoint city. You can find HM rock climb on the way to snowpoint city just lying on the ground.
go to acuity lake (must have rock climb) then talk to Barry, then go to galactic Veilstone HQ building, and from there to Spear Pillar
all the beginners can learn rock climb
beat gym leader Candice
you use the move rock climb, but u have to beat the gym leader candice
The 7th Gym Leader Candice (Snowpoint City)
You need the HM rock climb to enter lake acuity. But you can't use that HM until you defeat the gym leader Candice in snowpoint city. You can find HM rock climb on the way to snowpoint city just lying on the ground.
go to acuity lake (must have rock climb) then talk to Barry, then go to galactic Veilstone HQ building, and from there to Spear Pillar
Get pokemon red
all the beginners can learn rock climb
The HM Rock climb is on route 217.
You'll find it on Route 217.
You have to get the HM rock climb from Snowpoint City, beat Candice (the seventh gym leader with ice type Pokemon; you can catch a fighting Pokemon or fire Pokemon and defeat her) Then, you have to use rock climb and get to spear pillar. There Giratina comes and swallows Cyrus. You go into the portal there to follow Cyrus. There you follow Cyrus and then battle him. I recommend a Pokemon lvl 61 or higher. Then you fight Giratina after Cynthia restores your Pokemon. You can capture or kill him. After that you can get past the person in Pastoria and onward to Sunyshore city to the 8th gym leader with electric Pokemon.
Geodude cannot learn rock climb.
Actually, you can't get HM Rock Climb on Pokemon Ruby, its only available in Pokemon Diamond, Pearl and Platinum.