There is an Action Replay code for Celebi on Pokemon Diamond. After entering the code, walk through areas of grass to encounter the Celebi.
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You Can ONLY Get Celebi In Pokemon Diamond By Using Action Replay.
There is no action replay code for getting celebi just catch it in pokemon leaf green
I'm afraid you cannot get a Celebi in Pokemon HeartGold, unless you use a Action Replay. The only Celebi legal, I think, is the Nintendo Event that has passed. If you do have the Celebi in your GameBoy Pokemon Cartridge, then you can migrate it to Pal Park, then trade from Pearl/Diamond to HeartGold/SoulSilver.
I got my Celebi for Emerald from the Pokemon 10th Anniversary. You can only get it through Pokemon events, or cheat devices such as Action Replay.
action replay