I really don't know how you open it. I have ruby, and have all eight badges, but all I found was a description written in dots if you swim southwards.
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Ruby & Sapphire- Braille If you mean the Braille here is what the Braille reads Sealed Chamber- IN THIS CAVE WE HAVE LIVED. WE OWE ALL TO THE POKEMON. BUT, WE SEALED THE POKEMON AWAY. WE FEARED IT. THOSE WITH COURAGE, THOSE WITH HOPE OPEN A DOOR. AN ETERNAL POKEMON WAITS. Sealed Chamber- FIRST IS RELICANTH LAST IS WAILORD. Mt. Ember- EVERYTHING HAS MEANING EXISTENCE HAS MEANING BEING ALIVE HAS MEANING HAVE DREAMS USE POWER Dotted hole Floor Puzzle- B1F Up, B2F Left, B3F Right, B4F Down Dotted hole Bottom Floor- LET THE TWO GLITTERING STONES ONE IS RED ONE IS BLUE CONNECT THE PAST. TWO FRIENDS SHARING POWER OPEN A WINDOW TO A NEW WORLD THAT GLOWS. THE NEXT WORLD WAITS FOR YOU
I don't think you can, in emerald you need the nationaldex and POW! it's open but in ruby and sapphire you can't.
First, you must complete the puzzle on Route 134 and the Sealed Chamber. After that, three mounds across Hoenn will open up to show a hidden cave. Registeel resides in the Ancient Tomb on Route 120. However, be warned - there is Braille there.
You dont open doors. Theyll be open or when you walk into one youll go through. Some doors may be locked and youll have to find the way to open them.
If you surf from Pacifidlog town to the right from just the right place you end up at a open spot surrounded by shallow water with a dark spot in the middle. Dive on the dark spot and exit that room you land in. Go down and once you get to a weird pattern on the wall go back up to the surface. You should end up in the Sealed Chamber. There, if you click on the walls you will see a bunch of dots. That is the main secret i know of.