In route 229, enter the sandstorm area and go south until you reach a big rock surrounded by six smaller rocks.
I don't think you can get regirock in pokemon ruby.
It's different in different versions.
in mystery duguen or Pokemon games?
in aegis cave in the rock chamber{ice will be first so you will fight regiice then regirock}
In Pokemon mystery dungeons explorers of sky the regis are in watchman cave
Get Regigegas from the giveaway and go into the cave on route 224
It's really simple: You just go in the middle of the cave.
No,you can only catch it in a cave in route 111.
Regirock - Above The Resort AreaRegice - Take The Path To The Spear Pillar And You Will See It On Just Before The Cave Exit To The Snowy Area.Registeel - You'll Find it in A Cave On Iron Island. The Cave Is Near The Exit.You Need The Regigigas Form The Pokemon Movie 08 To Get Them.
In pokemon platinum, go to the desert route, then go down the hill, where you should see a darker spot in the rock. That is the entrance to Regirock's cave.
There is no cave for the regis in Pokemon ruby. I have the game no regice regirock or steel.
aegis cave at level 49, along with regirock, regice, and registeel.