Ancient Tomb

Ancient Tomb is a location in Hoenn. It is located along Route 120. In the innermost chamber, you battle Registeel at Level 40. Its moveset will be Superpower, Metal Claw, Curse, and Ancientpower.

To get to Registeel, you must first open the ruins by completing the Braille puzzle on Route 134. This is done by surfing there, diving in the correct place, then travelling to a braille inscription. After reading it, use Dive again to surface in a cave. Go to the north of the room, and use Dig after reading another inscription, and the wall will collapse.

Head into the next chamber and read the inscription at the north wall. Then, put a Relicanth first in your party, and a Wailord last (for Ruby/Sapphire) and read the inscription again. there will be an earthquake, and you should hear the sound of three doors opening far away.

In Emerald, the order is reversed, you put Wailord first in your party, and Relicanth last.

Go back to the Ancient Tomb and enter the first chamber, read the inscription on the north wall, then (for Ruby/Sapphire) go to the centre of the room and use Fly. The door will open and you can go into the next chamber to face Registeel.

In Emerald, instead of using Fly to open the door, you use Flash