Pokérus is a permanent status condition that affects a Pokémon. Here's what you need to know about it:
* How it Works: Pokérus doubles the speed at which a Pokémon gains EVs (Effort Values), which determine a Pokémon's stats. This makes it extremely valuable for competitive battling.
* Contagious: It can spread from one infected Pokémon to another in your party.
* Effects: It will show up as a pink "virus" icon on your Pokémon's summary screen.
* Duration: It lasts for 24 hours in the real world, and then becomes dormant, but still provides the EV gain bonus.
* Healing: Healing with items or at the Pokécenter doesn't affect Pokérus in any way.
In short, Pokérus is a beneficial condition you want to keep!