Getting Celebi in Pokemon Crystal and Silver
You can't without GameShark.
In past days, you would take your Pokemon Silver/Gold to poke events and they would give it to you. Then with Crystal (only in Japan) it was "released". What they did was set up a connection between a mobile phone and the game, and you recieived the "GS Ball", you'd then talk to Kurt whom triggers the "Celebi Event" in the game, he'll leave his house, talk to him outside, then head into the forest, use cut to continue on and examine the Shrine. A girl will be to your left, talk to her, examine the shrine again and use the gs ball when prompted. Thus Celebi will fly down and battle you, but like i said this occurs ONLY when you have a GS Ball and that's not an item you can get without hacking.
YouTube proves it and its the real deal answer. =( sadly...
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you use it the the celebi pokemon i think?
Celebi's are only obtainable through Nintendo events you can use AR or a pokesav to get a Celebi as well.
You can only unlock Celebi in Pokémon Crystal through a cheating device or via Nintendo events however events are no longer held for Pokémon Crystal.
By trading one from gold/silver and cloning it Dani (the girl Pokemon trainer on Pokemon crystal version) By trading one from gold/silver and cloning it Dani (the girl Pokemon trainer on Pokemon crystal version)
Raikou, Entei, Suicune, Ho-oh, Lugia and Celebi.