How do you open the 3 caves to catch Regice, Regsteel and Regrock?

Opening the Doors

1. Capture a Relicanth and obtain a Wailord. Relicanth can be found underwater on Routes 124 or 126, and Wailord can be obtained either by fishing on Route 129 or evolving Wilmer at level 40.
2. Withdraw both Pok�mon and place Relicanth at the front of your party and place Wailord in the last position.
3. Go to Pacifidlog Town and use Surf to navigate the current on Routes 132, 133, and 134. On Routes 132 and 133, stay as close to the bottom of the screen on the current as possible; when the screen says 'Route 134, run directly across that sandbar and use Surf.
4. In the dive spot on Route 134, go down and stay underwater until you come to a white mound. Go directly in front of the Braille inscription and press B to resurface. You should be in the Sealed Chamber.
5. Run to the back of the room, stand directly in front of the inscription, and have a Pok�mon use Dig. If you do not have Dig, go to the Fossil Maniac's House outside Fallarbor Town and talk to the little kid in the main room; he will give you TM28 (Dig).
6. Enter the next room, ensure that Relicanth and Wailord are in their proper places, and read the inscription in the back of the room. A tremor should occur, telling you that you now have access to Regirock, Regice, and Registeel.

• Regirock is in the Desert on Route 111. Go ito the monolith surrounded by six rocks, enter, read the inscriptions, walk two paces right and two paces down, and then use Strength. Regirock should be in the next room.
• Regice lives just off Route 105. Go to the sandbars with trees, travel up the path past the sandbars, and enter the monolith at the end. Read the inscriptions and don't do anything for the next two minutes; after that time, the chamber will open and you will have access to Regice.
• Registeel is on Route 120. Go to the staircase to the west after passing Bug Maniac Brandon, walk through the tall grass, and enter the monolith. Go to the center of the chamber and use Fly; the wall will open to reveal Registeel.