The Pokérus is a special status condition that a Pokémon may get, first appearing in the Generation II games. Unlike other status conditions, it cannot be healed at a Pokémon Center or with any status ailment healing item, and can only be obtained by the Pokémon in question once. When a Pokémon has had the Pokérus, it gains double the effort points (i.e., fighting a Magikarp will give two Speed EVs, rather than one). The virus takes about two days to wear off of an infected Pokémon, but the period of time can vary.

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