you Cant... got to trade with Fire red!
prass start abababbaaa
get all the Pokemon in the pokedex then talk to birch
either you hack it or you unlock all of the areas and find every single Pokemon
Piplup does not exist in Pokemon LeafGreen or FireRed.
No, you cannot find cyndaquil in LeafGreen.
You find the ruby and give it to celio
you should go to gamestop
use a code
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