What is bad egg for in Pokemon Emerald?

Answer 1

A bad egg is an egg that never hatches and stays in your PC forever, and if you move it your PC glitches up.

That is true, but there are some other things a bad egg can do. I have one, so I should know. Here's how I got it

1: Used GameShark pokerus cheat.

2: Started Emerald version

3: Fought a trainer.

4: Caught his Pokemon. (part of the odd-cheat)

5: Nicknamed it Linoone.

6: Checked my party.

7: Linoone was a bad egg with pokerus!

My bad egg never lost its pokerus because the eternal clock stopped working. I put it in my party and gave all my Pokemon pokerus. Also, if you put bad EGG in a PC and a Pokemon next to it, it will turn into a bad egg. I never tried it because one bad egg is enough. They can't be deleted unless you delete your save file.

And about the PC glitching up, that's not true. I moved it from one box to another and nothing bad happened, and you can put it in your party.