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You can find Braille lettering in Mount Ember in the Pokemon series. You can easily translate the meaning by looking up the Braille alphabet.
The first room is the braille alphabet. The other room says: "everything has meaning, existence has meaning, being alive has meaning, have dreams use power".
The Braille in Mt. Ember on Pokemon FireRed reads "Everything has meaning Existence has meaning Being alive has meaning Have dreams Use power. ". You can confirm this by using the Braille alphabet in the room before it.
Inside the cave that the Rocket Grunts opened you can find boulders to move using Strength. After passing them you will find an intersection where you can choose to go down or right, choose down. This should lead you to the room with the Braille alphabet and then the Ruby.
There is no item called a Braille Reader in any Pokemon game. However, in Pokemon Emerald, the player does not need to be able to read the visual braille in order to obtain the Regis Pokemon, and many players have already decoded and shared their findings on the internet.