i always keep a pokemon in my PC with the virus, i also place all pokemon that hav the virus in the PC overnight, otherwise it'll b erased @ 0:00. im EV training a team right now that im using that method 2 preserve their pokerus. u just hav 2 remember 2 box em each day. i got my Macho Brace from Emerald. im a little different as i keep track of EV's on an index card, marking them down each time i encounter a pokemon i know i can defeat.