So here is the question: Can eggs in Gen V get Pokerus? I ask this because the other day I was hatching eggs and my Volcarona had pokerus and it infected on of the eggs. Is this legal or a glitch? Thanks :D
Yep. it's possible...
Pokérus has a 3 in 65,536 chance of being generated on a Pokémon, either wild or bred.
Also, when you fight and an egg is near an infested Pokemon, they have the ability to gain PKRS as a hatched Pokemon would.
Source: Bulbapedia + Experience
Pokerus is passed when the infected Pokemon participates in a battle. my guess is that had just battled and the pokerus was caught right after the egg hatched... I'm not 100% on the delay between but I have had some odd things happen with Pokerus and the actual time of "infection".