Have a Slugma in your pack (his ability, Flamebody, cuts in half how many steps you have to take to hatch an egg) and also ride your bike to at least through 5 cities.
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You have to walk around with it. It will hatch faster if you have a Pokemon with the ability Flame Body.
pokemon that have the abiliti magma armor cammerupt,sluga,and macargo or ar code for quick egg hatch
Phione egg needs 10 240 steps, so just walk around or cycle around. If you want hatch it faster, you have to keep Pokemon with ability flame body in your party. Its twice faster.
It takes 7,680 Steps to hatch a Cranidos. And it hatches faster when you have a Pokemon with the ability Flame Body
Put them in your party with Slugma/Marcargo, this pokemon's body heat will warm the egg and make it hatch faster.