Pokerus (virus)

Pokerus is a special type of virus that pokemon catch but it is not bad it can spread throughout your party and it helps raise your pokemons exp

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It was mentioned by professor oak in the pokemon chronicles series

PCV2E5 Oaknapped Tracey and richie investigate Professor oak's dissapearence and discover thst he has been kidnapped by team rocket as part of a sinister plot to develop more powerful pokemon!!!!!!!!!!!!