It can take forever or even a short period of time don't let that happen though!
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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!
You personally can't do that unless you catch a wild Pokemon already infected with pokerus then as long as you keep it around the virus will spread to other Pokemon.
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.
You cannot cure Pokerus yourself since once Pokemon are infected with it then they will keep it forever however each new day (up to 4 days) the game will decide whether to cure the infectious nature of Pokerus or not. Pokerus is a good thing to have since it will double the amount of EVs that the infected battling Pokemon will earn when an opponent Pokemon is defeated and as long as it remains contagious it can spread Pokerus to other Pokemon in your party however the game will not get rid of the contagious or infectious nature of Pokerus if the Pokemon is placed in a PC Box.
Get a Pokemon with Pokerus and put the Pokemon you want to have it in the party with it. To transfer the PokeRus condition to other Pokemon, have the infected Pokemon in the party with the desired Pokemon and take it out to battle. After a few battles, most (or all) of the Pokemon will have contracted PokeRus.