None of my pokémon are, or have been infected, with pokérus.
I've now tried a few things:
1. Having the egg appear in the party: hatched with pokérus.
2. Having the egg appear in a box(tried several) and withdraw it: hatched with pokérus.
3. Catching a wild pokémon with a free party slot: no pokérus.
4. Catching a wild pokémon with full party so it transferred to a box(tried several): no pokérus.
5. Recieving an egg "legally" from the day-care couple: hatched with no pokérus.
6. Starting a new game with the same results as 1 and 2.
It's not that important, but it annoys me that I can't make an egg without pokérus.
If I copy the code for an egg here, can someone analyze or try it?