It is different for each Pokemon. However, if a Pokemon with the ability Magma Armor or Flame Body is in your team, the number of steps needed is halved. Here is a list of Pokemon that can have these abilities;
Magma Armor:
Flame Body:
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It takes 10,496 steps for a Larvitar egg to hatch.
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i don't have Pokemon emerald, but the answer is always the same. not how long. how many steps. walk ALOT and the egg will slowly start to hatch
It Takes 5100 Steps to Hatch Staryu EGG
Every Pokemon is different. For example: Mareep takes about 5,120 steps to hatch while Burmy takes about 3,840 steps to hatch.