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you can't hatch a pikachu egg on diamond, it hatches in to a pichu.
It depends on the Pokemon you are hatching.
It takes between 9,180 and 9,434 steps to hatch an Eevee egg. You can halve this time if you have a Pokemon with the Flame Body or Magma Armor ability in your party.
5355 steps.
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about 7,000 steps
you can't hatch a pikachu egg on diamond, it hatches in to a pichu.
It depends on the Pokemon you are hatching.
It takes between 9,180 and 9,434 steps to hatch an Eevee egg. You can halve this time if you have a Pokemon with the Flame Body or Magma Armor ability in your party.
5355 steps.
It takes a maximum of 5,120 steps for a Nidoran Egg to hatch however it could be less than that due to the fact that eggs are randomly generated.
it counts what kind of Pokemon it is
It takes 9,180 steps or 36 Egg Cycles to hatch an Eevee.
it will take 999999999999 steps to hatch a egg
I tested it on my platinum game and it took me 11,475 steps to hatch my gible egg i don't know if its the same for dimond or pearl.
It takes a Riolu Egg a maximum of 6,400 steps to hatch however each Riolu Egg is different so it could hatch earlier depending on the Egg and other factors involved.