There are two ways to get this.
1] Get a GameShark and go to Gameshark.com to get the cheats.
2] Go to a Nintendo Event and they will give you it. You need to have Mystery Gift, which can be activated by going to a Pokemart and if you look on the counter, you will see a questionnare. write "Link Together With All" and you will unlock Mystery Gift.
you cannot catch celebi in Pokemon leafgreen. you can only get it through cheat codes or trading.
cheat.
Nintendo events
not possible
you can trade it
you cantansweru cant u have 2 trade from hoen or joto or sumthing
You cant get him. I think its only through an event.
you cant catch celebi in the gba games except with a game shark cheat system
Celebi cannot be obtained in Pokemon FireRed or LeafGreen legitimately without trading. There are no events for Celebi currently and an GameShark may be required.
without gameshark or action replay, NO
you cant find celebi in soulsilver
You need the event to find celebi without cheating.