Put them in your party with Slugma/Marcargo, this pokemon's body heat will warm the egg and make it hatch faster.
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There is a code on Supercheats.com for fast egg hatch, but otherwise no.
There isn't a way to make it hatch fast, but the best way is to put the egg first in your party. It doesn't walk with you, the Pokemon who you put 2nd in the party will but it's a pretty fast way to hatch an egg though.
No they don't hatch.
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.
Well, the way I get taillows is to breed two swellows, and hatch the eggs. The eggs take around 3000 steps to hatch. The taillows evolve into swellows at level 20-22 as far as I know.