There is no Pokerus in Fire Red , im sorry :(
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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.
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.
A Pokemon can get Pokerus in any game. You can get pokerus by meeting a wild Pokemon infected by Pokerus. When you have Pokerus, all Pokemon that is with it (your party or a box etc. ) will also be infected by Pokerus. But if it is kept in your party, Pokerus will gradually go away. Your Pokemon does still does get boosted EVs however. if you want to have a pokerus in ur Pokemon that badly just use action replay code to get it... and if u want to remove it then just change your date like 5 days or more
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.
http://www.neoseeker.com/Games/action_replay/