Not without trading from a 3rd gen game.
There are no codes for any of the core Pokemon titles.
you cannot catch celebi in Pokemon leafgreen. you can only get it through cheat codes or trading.
You cannot catch Celebi unless you are using cheat codes or waiting for Pokemon events.
YOU CAN'T GET CELEBI IN DIAMOND WITOUT MIGRATING
You get Celebi by using codes or glitchs Depends on what game. In the normal versions, you can use events or codes and glitches. In mystery dungeon, you need to find Celebi'[s dungeon.
Yes you can. Just Google, 'Pokemon (whatever game) AR codes" and find the wild Pokemon modifier code and use Celebi.
You can get it only at official Nintendo events. Or using an AR and cheat codes.
The only legitimate way to obtain Celebi and Mew is through a Nintendo event. In FireRed and LeafGreen you will need an event-only item to travel to the last two islands where you can catch those Pokemon
Celebi HFIF338ID3N38 Jirachi F7739HHD339G
by entering cheat codes
Celebi can know longer be onbtained in Pokemon Emerald as far as i know of, however legit. If you are desperate i suggest you use gameshark codes or action reply, each can be obtained at various outlets
to get the code go to codejunkies.com. or go to Google and type Pokemon pearl action replay codes..