Simply trade between ruby, sapphire and emerald, remember to trade with emerald you need wireless adapters.
The Pokemon day care for Pokemon Leafgreen/Firered is on island 4. You have to beat the elite 4 and get the machine on island 1 working to go there.
No such thing exists.
He is on 1 island in the Pokemon center building in front of the huge machine
get both ruby and sapphire to the man next to the machine
Yes you can trade leafgreen version Pokemon to another leafgreen version.
He is in the one island Pokemon center he's the guy with the glasses near the big machine.
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?
you need to fix that professors machine on the sevii islands (the seven islands) the ones that you unlock after the league
Celio is the man standing right by the giant machine in the One Island Pokemon Center you can't miss him.
after you get the machine part you take it to the kanto power plant where Zapdos used to be at Leafgreen and Firered aha you're welcome
go to the Pokemon lab on cinnbar and go to the last room talk to the dude by the machine. he well transform them for you the Pokemon will be at Lv5.
you should go to gamestop