In the Pokemon games, to my knowledge, an egg cannot go bad. It may seem like it will not hatch but this is because some eggs take longer to hatch than others.
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You can get a bad egg with action replay. I know this because I used a ar code to get a shiny mewtwo , but insted I got a bad egg!!!Now I don't know what to do with this stupid thing.
i do not know it but happy cheating
You can get a bad egg when you hack with Gameshark when it hatches it becomes an egg then you have to hatch it again your game might freeze and crash so don't hack!
smell it, you'll know it once you do. . .
I don't know I wish I could get rid of my bad egg