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If you mean PokeRus, it is short for, "Pokemon Virus". However, it is not bad (It's only negative affect is lowering your Pokemon's friendship) , on fact it is very good for training your Pokemon. It doubles the amount of EV's (effort values) that a Pokemon receives when they defeat another Pokemon. When the Pokemon's immune system has fought off the disease, the good effects stay, and the bad effects leave.

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14y ago

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