The bad egg is basically a glitched up Pokemon egg if hatched it can totally ruin your game because nothing is inside it hence why its a glitched up egg. Inside we all know by now is called Missingno or AKA the Missing Number AKA #152 of the Kanto region which is a baby kangaskhan for those who don't know.
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yes
no! it just freezes your game
you should start the game from the beginning.
A Bad Egg is a glitch in the game. Having a Bad Egg is not a good sign in playing it. Bad Egg can hatch at any time. Hatching Bad Egg can cause your game to corrupt as well as your game files.
if u use any masterball cheat u get bad egg in Pokemon PC