depends wat pokemons in it.A starter takes around 3200 steps,but if you carry a Pokemon with magma armor(macargo)with you the steps will decrease by half.
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you run around sinnoh and it will hatch.
Yes
You have to walk around with it. It will hatch faster if you have a Pokemon with the ability Flame Body.
you can't hatch a pikachu egg on diamond, it hatches in to a pichu.
you walk around for ages and ages and it will eventually hatch