you get deoxys on birth island. to get there, you must obtain a ticket to do this you must go to a Nintendo event which is a event where Nintendo give out stuff for your game.
You cant without an AR
20F on 20 is Deoxus. You can't go up if you don't beat mirage Deoxus.
Piplup does not exist in Pokemon LeafGreen or FireRed.
No, you cannot find cyndaquil in LeafGreen.
you should go to gamestop
Beat the game, and go to mossdeap space station. If you have played the game enough time a man in a lab coat will say, "that is successful launch 100!, would you like to go to space?" Answer yes and you will go to space. If it was successful launch 100 you could walk around and soon find deoxus. If it wasn't, you will find juraichi. If you messed up you will have to find deoxus island which you can't do till you find mirage island....(I don't know how to find either :)(:
LeafGreen version does not have Growlithe.
In the grass...
You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
there is no such Pokemon
That item doesn't exist in leafgreen.
you can't catch aipom in leafgreen but you can get one from Pokemon colosseum or Pokemon emerald.