Write an article based on this "Capture Regirock Capture Regice in the Ruins on Route 105. Capture Registeel in the Ruins on Route 120. Remember to save your game before turning off your Game Boy Advance or Nintendo DS system."
in the Desert Ruins. It is located toward the bottom of the desert near Mauville along Route 111.  Go over to the braille sign in the north end of the cave and press A to read it. Then go two steps left, then two steps down and use Rock Smash. You'll want to save here before battling, just in case you don't catch Regirock, so you can have another chance. You'll see the text "Island Cave" in the upper left corner of your screen.  Go over to the braille sign on the north wall and press A to read it. Staying next to the walls at all times, do a counterclockwise lap (walking, running, or on your bike) around the entire cave. Once you do, the wall with the braille sign will reveal a cave entrance for you to enter. You'll want to save here before battling just in case you don't catch Regice, so you can have another chance. Regice has an Ice Wind skill that will lower your Pokémon's speed. You can use a Pokémon with Yawn to get rid of this effect. You'll find it in the middle of wet fields and grass. The words "Ancient Tomb" will show in the upper left corner of your screen.  Go over to the braille sign on the north wall and press A to read it. Go to the middle of the room and use Flash. You'll want to save here before battling, just in case you don't catch Registeel, so you can have another chance.