How to catch me:)

[celebi]

I guess you have to catch all pokemons in the game but how can you get a celebi if you can't trade with G/S/C.

[InvertrevnI]

I guess you have to catch all pokemons in the game but how can you get a celebi if you can't trade with G/S/C.
You can't. :/ I've said this before, Nintendo event or shark.