They never go bad. Ever.
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Bad Eggs very rarely, if ever, hatch. They're not really Pokemon eggs. If they do hatch, they hatch into a glitch Pokemon or another Bad Egg.
Bad eggs mess up your game.But at your ownrisk you can hatch a legdndary pokemon.
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A bad egg is a bad egg.
Bad eggs won't destroy your game. I don't entirely know much about them, but most don't hatch. Try to get rid of it, though. Bad eggs are called so for a reason!