Pokemon Virus, or Pokerus, can be infected into your Pokemon by battling a wild Pokemon with Pokerus, or having a Pokemon with Pokerus in your party, and a non-infected Pokemon in the next slot, and battling. The Pokemon after the infected one may become infected. If not, try again. Notee that Pokerus is only transferable for two days (this includes when the DS is turned off). You can delay the being cured of Pokerus by putting a Pokemon in the PC or Daycare. However, even if Pokerus is cured, the EV boosting effects do not wear off; you just can't infect other Pokemon anymore.
The Poke virus on Pokemon diamond and pearl actually gives non-traded Pokemon a extra exp boost although it doesnt say it. it is very rare though.
Pokemon diamond
Pokerus is a type of "virus" some might say in game. It's a type of virus that latches to a pokemon, and makes it level up just a bit faster. Even though it is a virus, there is nothing to be worried about. Pokerus is uncurable, and has a chance of spreading.
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in Pokemon diamond