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Celebi's are only obtainable through Nintendo events you can use AR or a pokesav to get a Celebi as well.
It was originally to catch the event legendary pokémon, Celebi.
The GS ball has celebi in it but you can get it through a event or get it by entering an action relay code
after getting all the unowns at Ruins of Alph when you go in the Ruins of Alph a celebi comes
sorry you have to trade it to Pokemon soul silver