Special Events, trade, and cheats.
you cant you have to get a celibi from game stop and trade it in to Pokemon black or white
Find an event giving it away
You have to transfer Celibi from one of the older DS Games.
yes it has to be the event celibi or the shiny legend dogs
from an event or by tradingSpecial Event or (*cough*) cheats.
To get Celebi into a Pokemon Black or Pokemon White, you must transfer it via Poketransfer, which is only usable after beating the Elite Four. Follow the route to the right of Nimbasa town, cross the bridge, and you will find it :)
Go to a game stop event for obtaining Celibi
You Cannot actually get Celibi on Either Colosseum or XD: Gale of Darkness, However you can Get Celibi on Pokemon HeartGold and SoulSilver. In Pokemon Colosseum if you use The Flute Thing that purifies Pokemon Celibi will come to Purify Your Shadow Pokemon. I'd Reccommend using it on Something like Metagross, Tyranitar or Raikou or something like that.
first you need celibi then you go to the city with sky scrapers and get the relocator then go to a building and there is a kid talk to him with celibi in your party and he turns into zoroa.
I'm sorry, the only way to get Celibi in Emerald is to cheat with gameshark.
In the National Pokedex, the 251st Pokemon is Celibi.
There will be an event to get celibi somewhere in '10. keep your eyes on pokemon.com! They will give updates on events to get celibi. Hope it helps!