Bad Egg Troubles

It's only like that when a Pokemon you have is hacked into the game through via Action Replay. I don't know of any way to prevent it. But I know you can use non-hacked Pokemon with hacked moves on it. Just not on a WiFi match with unregistered friends. Hope this helps you out.

If a Pokemon is hacked with a Action Replay then yes it will do this. As far as I know you can't prevent it. You can use hacked moves on Pokemon as long as the Pokemon itself isn't hacked. Though you wont be able to on wifi. Hope I helped

Well this happened to me one time in Pokemon pearl I had an egg that sooner or later was going to be an arceus but then it turned into a virus and then one of my Pokemon in the party dissapeared or it was realesed so be carefull wih action replay eggs...hope I helped and sorry for answering one year later

Lucky there is a cure for bad eggs(well only for those who bypass the 510 ev's)go to this link. http://www.youtube.com/watch?v=5N6h3IwdEJE
go to the description box and copy any one of the codes(perfer the ev's codes),when you start your game,you have to mark the pokemon that bypassed the 510 ev's.when you look at the pokemon's stats 5 of the stats will decrees but only one will remain normal.thats how i cured my pokemon from the bad eggs

Pokemon Battle Revolution Checks for Certain things on Pokemon to see if they are legit or not.
- Pokemon
- Pokemon Ability
- Pokemon IV's
- Pokemon EV's (Exceeded 255 in each stat or not)
- Pokemon EV's surpassed 510 or not
- Fateful Encounter for Event Pokemon
- Pokemon Ribbon
- Classic Ribbon for Pokemon like Darkrai and Shaymin
- Pokemon Game Country
- Place Met
- Level Met
- If Hatched; Whether it's from a Link Trade or bred by oneself and hatched by whom
- If Shiny or Not (Especially counts for Pokemon Like Celebi, Manaphy and Jirachi, those three are not allowed shiny)
I hope this helped. ^w^