That's sound very good and it ease the pain when I lose pokerus on one of my pokemon.I have plenty of test evidence. I've EV trained lots of Pokemon thanks to Pokerus, and on occasion I've had a few lose Pokerus before I finish training it. When I finished training them with the same number of battles, they had the same stats that they would have even if they kept Pokerus. So we can conclude that the double EV effect remains after it disappears.