If you mean the Unown symbols, they are Pokemon! They are also considered a type of writing. Each Unown is a letter, from A-Z. They can also be ! or ? marks.
For more info on Unowns, and what they can look like, you can try out Bulbapedia. Here's the link:
http://bulbapedia.bulbagarden.net/wiki/Unown
the braille alphabet is the language that is needed to get the three regis. if you do not know the braille alphabet you have to buy the Pokemon emerald version handbook.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
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
there are 5 legendary Pokemon in leafgreen version
LeafGreen version does not have Growlithe.
its only available in Pokemon leafgreen version sorry
firered and leafgreen version
the sapphire is INSIDE the mountain after kindle road where the rocket grunts are the ruby is in the dotted hole on 6 isle. the sign is in braille. use cut to get in.
There will be a translation in the instruction manual that comes with the game. If you don't have this manual, look up "How to decode braille" There probably won't be any results if you add the "in Pokemon Emerald part
lavender town
You cannot catch aipom in leafgreen however you can in emerald or Pokemon colosseum.
On that Island, where you found those dots, called Braille, have a Pokemon that knows the HM Cut. Use Cut on and facing the door that contains the Braille message as if it were a tree! And within, I forgot what the cave contains. Sorry! You can learn how to decode those dots, Braille, with the Internet. Just type in Braille on Yahoo! or Google Search to find the letters of the American alphabet translated to Braille!
Louis Braille developed the Braille alphabet over a period of several years, starting when he was a teenager. He began working on it in 1821 at the age of 15 and continued refining it until he published his first Braille book in 1829. So, it took him around 8 years to develop the Braille alphabet.