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You must input the correct code in a gameshark to get jirachi, and then go to the space station, and from there it is pretty straight forward.
Well you could trade with Pokemon colisseum or you can get a gameshark and input the code to get jirachi
No.
what do you do after you get a mystery gift in emerald?
yes
Cheating
There is no jirachi's cave.
you need Pokemon channel for gamecube and you get Jirachi as a bonus.
Celebi HFIF338ID3N38 Jirachi F7739HHD339G
yes with an event.
Trade from Pokemon colosseum
find it.