pokerus is actually a plant on all Pokemon games after crystal. The plants' spores attach themselves to wild Pokemon. When you run into the Pokemon, sometimes the spores will rub off on your Pokemon. When this happens, your Pokemon will grow really well.
Even Pokemon in gold,silver, and crystal could catch the pokerus.
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If you get a Pokerus, then you're very lucky. So keep the Pokemon that you want to get the Pokerus spread to, and keep them in your party. As you travel, the Pokerus will gradually spread to all of the Pokemon in your party. Another great note - If you want every single Pokemon you have to get Pokerus, then keep one Pokemon with Pokerus in your PC Box. I think the Pokerus doesn't go away there, so you can keep on spreading Pokerus to every other!
The Pokerus is not a cheat, but a random status aliment that Pokemon can contract. Obtaining Pokerus is largely random, but can be spread by having a Pokemon with Pokerus in the party with other uninfected Pokemon.
There is no Pokerus in Fire Red , im sorry :(
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 happens at random, it is about as rare a finding a shiny pokemon.