Read the braille, then don't touch the game for about 2 minutes. This will open the door to Regice.
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use flash in the middle of the tomb
First you need a Pokemon that knows Rock Smash. Regirock is found in the desert ruins on Route 111 (in the desert). Once you're in the desert, make your way South and you should find Regirock's tomb. Be sure you have unlocked the entrance first (done in the Sealed Chamber). In the tomb, the Braille code reads: "left, left, down, down. Then use Rock Smash." Follow these directions; tapping the directional button to move just one step at a time. The door to Regirock should reveal itself and you can catch it. (I acually decoded the Braille lettering in order find this out so if you have any problems decode the braille first. Then do what the Braille says to do, in order to get him open. If you dont know braille lettering then go to the search engine you use on your computer and type in "braille" they will give you sites that have braille lettering on them. Use these sites to help you to decode the Braille.)
You can find Registeel in the Ancient Tomb on Pokemon Ruby, Sapphire and Emerald. It can also be found in the Underground Ruins of Pokemon White2. To get Registeel in Pokemon White2 you need to catch or defeat Regirock and use the Iron Key reward to unlock the Iron Chamber containing Registeel.
The move Rock Tomb is a TM, not a HM.
It's actually easy! She has I think 2 level 11 or 12 geodudes and a level 15 or 16 nosepass. The Viridian forest will have pokemon that will beat her easily. Nosepass has the move rock tomb so watch out! Hope this help!!