What is pokerus on Pokemon platinum?

Pokérus is a virus in the Pokémon video games that can be transmitted from one Pokémon to another. It is not harmful, and in fact can be beneficial, as it can temporarily boost a Pokémon's stats. In Pokémon Platinum, Pokérus can be spread by having two Pokémon in the same party, one of which is infected with Pokérus. The other Pokémon will have a 50% chance of catching the virus each day. If a Pokémon is infected with Pokérus, a small virus icon will appear next to its name in the party screen. Pokérus can be cured by using the Pokérus Vaccine item, which can be purchased from the Pokémon Mart in Jubilife City.