Noted I don't competitively hatch pokemon nor do I shiny hunt with the egg method but, Phione has to be the pokemon that takes the most steps to hatch without a shadow of a doubt.
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All the Pokemon eggs take the same amount of time to hatch so it does not take longer or shorter depending on witch one it is.
that is not true, some take shorter than others
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.