It is a helpful virus that is ultra rare and lasts for a day. If, for example, you KO a lv. 2 zigzagoon like I did, It had purple colored status. I took him to Nurse and she told me stuff. Put the infected pokemon in the PC makes an army of pkrus
Go to the move deleters house and save in front of the tv. Then a week later head back and you will see the tv flashing.
leave the pokemon you want to raise in the daycare and leave it on all night. then there will be at lv100
(HINT:leave the gameboy on charge so it does'nt wear out with an unsaved game
To do this, you need an acro bike. Set two of your pokemon that you want to raise in the daycare to the left of Mauville. Now go to a sandy slope at the top of the desert area (make sure you're facing the slope). Then place a somewhat heavy object (like a glass cup) on the up arrow of the gameboy, make sure you balance the object up against something so it doesn't fall over.*HINT*if you have one of those things that plug your gameboy into a wall, it would be preferable so the battery won't die down overnight.
All you have to do is catch all three Regis. Then raise all of them to lv.100 and take them to the lottery corner on the first floor of Lilycove Department Store.*HINT*an easy way to raise them to lv.100 is to leave them in the daycare for a while.