The action replay code for Pokerus in Pokémon Diamond is 12069C5E 00004288. This code causes the Pokémon to be stronger but is a disease that can never be cured.
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The action replay code for Pokerus on Pokémon FireRed is 12069C5E 00004288 94000130 FFFE0000 12069C5E 00004280 D2000000 00000000 This code has been tested and verified.
Pokerus is a virus that effects random wild Pokemon, effecting their status leveling. There's no way to force pokerus, except an Action Replay code for Diamond and Pearl which will cause an "infestation" in your party. The code was once on Supercheats.com, but for some reason, I can't seem to find it... it is a rare disease that you may not get in diamond or pearl but if you do get it you'll get it from a wild Pokemon battle then nurse joy will tell you you have the pokerus disease, you can get it on ar too.
There is an Action Replay code for Celebi on Pokemon Diamond. After entering the code, walk through areas of grass to encounter the Celebi.
http://www.neoseeker.com/Games/action_replay/
yes there is a code to action replay i don't know, though