You can walk with your Pokemon in Amity Square which is located in Hearthome City. However, you need a Pokemon that is "cute". Ask the ladies at the front to find about the "cute" Pokemon.
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you walk there
Walk through mount coronet
you can't, only in pearl, diamond, and platnium
You have to walk around with it. It will hatch faster if you have a Pokemon with the ability Flame Body.
You can't