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You Can ONLY Get Celebi In Pokemon Diamond By Using Action Replay.
There is an Action Replay code for Celebi on Pokemon Diamond. After entering the code, walk through areas of grass to encounter the Celebi.
YOU CAN'T GET CELEBI IN DIAMOND WITOUT MIGRATING
It is under the bush in the yugugu cave
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.