Walk a lot of steps.
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It's impossible to hatch a BAD egg.
you just have to encounter the Pokemon that is going to hatch out of the egg about 1000 times and if your lucky it'll be a shiny Pokemon hope this helped:)
usually a bad egg can not hatch, a bad egg is NOT A WIFI EVENT, if bad eggs do hatch the game will either freeze or will hatch into another bad egg other Pokemon eggs at the time of a bad egg may hatch into bad eggs instead of Pokemon.There is no such thing as a bad egg in Pokemon.A bad egg can never hatch from itself it will just stay as a egg
you run around sinnoh and it will hatch.
To hatch and egg in D/P walk around with it. The amount of steps needed depend on the Pokemon type.