Pokérus has a 3 in 65,536 chance to be on a wild Pokémon (there is no indication that the Pokémon has it, unlike shiny), Due to the over whelming rare chance its much easier to find a friend, or someone online to share the virus with you.
You can spread and catch the virus by simply having a Pokémon with Pokérus in your party.
wow the chances of getting it is so small! I was scared about pokerus first of all (I thought it would kill my pokemon) but now I feel honoured that my zubat has it so early on in the game! :)
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click on the pokemons summary in the PC and in purple it should say pkrs.
Sure, it is a rather short code... it is12069C5E 00004288 94000130 FFFE0000 12069C5E 00004280 D2000000 00000000
in soul silver
you don't have friend codes in soul silver.
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.