You can trade them through a link at the Pokemon trade center
I think you can only pass Pokemon from Emerald to Diamond/Pearl
No
Leafgreen and Firered, Pearl and Diamond
you can get Pokemon that are not in the other version
Not in Pokemon leafgreen only in Pokemon Firered never ever in Pokemon leafgreen And in Pokemon firered it is rare in power plant not available in Pokemon leafgreen?
No
no its not that hard. its the same story plot.
No. Riolu did not exist during Generation III, which was the generation Pokemon FireRed & LeafGreen versions were set in.
you can't you need to transfer from firered or leafgreen
That would be FireRed/LeafGreen/Ruby/Sapphire/Emerald.
You can trade between firered, another leafgreen, ruby, sapphire and emerald also Pokemon colosseum and Pokemon xd gale of darkness.
it is like Pokemon gold,silver,firered,leafgreen,yellow,Sapphire,ruby and emerald versions