Pokerus (PKRS for short) is a tiny virus that can sometimes attach itself to your Pokemon.You can't see it,but the receptionist at the Pokemon Center will tell you if your Pokemon have it when you bring them in to be healed.With Pokerus,a Pokemon's stats will grow more readily,so you can develop it to be stronger.The Pokerus will go away after a few days,but its effects remain.And if you put that Pokemon in your party while Pokerus is active,the other Pokemon will get it,too.A Pokerus infection is your chance to raise your Pokemon to become stronger.The Pokerus will go away,but it will leave behind a smiley face to show it was there.

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