There is no "braille decoder", you have to manually decode it yourself.
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It's on Six Island in that cave with the Braille.
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
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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.
Yes you can trade leafgreen version Pokemon to another leafgreen version.