go to Lilycove City. Go west through the grass and trainers. When you reach the area of the Safari Zone, keep moving. You will reach a place with a girl. Just above her are stairs. You must go up. Go through the very tall grass and go up the stairs behind it. The cave will not be too far after the stairs. Once inside, read the Braille at the back of the room. It reads "Those who inherit our will, shine in the middle." The riddle means that you should go to the middle of the room and use Flash. The cave door will open. Be careful with Registeel. This Pokemon is more difficult than the others to capture. Try bringing a lot of Ultra Balls or prolong the battle as long as you can by freezing it or putting it to sleep. After many turns the Timer Ball will have gained a lot of strength, and it might work against the Registeel.
P.S. don't forget to save just before battling it
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use flash in the middle of the tomb
All i know is in sapphire: you go to the middle of and use FLY
You have to get Kyogre and then go to the ciuty it is in and got to the chamber.
In Ruby and Sapphire, you have to fight the respective legendary before the doors open.
When you're in the Sealed Chamber, Relicanth should be first and Wailord should be last.