A braille reader does not exist in Pokemon Ruby or any Pokemon game with braille used as a puzzle. Translating the braille for yourself is very simple if you print off a braille alphabet sheet.
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you need wailord
Read the braille, then don't touch the game for about 2 minutes. This will open the door to Regice.
Braille key. With each Pokemon Ruby, Sapphire, Emerald, FireRed and LeafGreen version, you should obtain a Braille Key in the box. This gives you the symbols and the letters they stand for - which are used in the game. If you do not have this, it is easy to find. Wikipedia gives a Braille key under the heading "Writting Braille". Pokemon only uses the alphabetic letters and the symbols for the full stop and the comma. http://en.wikipedia.org/wiki/Braille
In second room in Sealed Chamber, make your party pokemon, Wailord first, and last in Relicanth. Then, read the braille.
There is no "braille decoder", you have to manually decode it yourself.