Well, according to some X and Y players..the Bad Egg from previous gens has been appearing on people's games via Wonder Trades. Nobody is sure where they are coming from but these eggs are unhatchable, untradable (even though people are receiving them via wonder trade) and will multiply in your pc and party. In past gens these eggs were anti hack methods used to punish whoever did not hack a pokemon properly (or so it is thought). My theory is that the people who are learning to hack the games may have traded a pokemon who, upon trading became a bad egg due to the games detection or something. I'd highly advise against Wonder Trading until the issue is dealt with. These eggs can replace pokemon in your party and pc boxes..so play with caution, Pokemon trainers.
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Bad egg in past gens: http://bulbapedia.bu...et/wiki/Bad_Egg
Pokemon X mysterious/Bad Egg reports: