How do you hatch a egg in pokemon black?

Answer 1

You walk and walk and walk (It depends on how rare the Pokemon is for the number of steps I guess think you should go up and down that big bridge that I forgot what it was called (The one to Castelia city)then it hatches when you have walked enough steps.

Answer 2

Make sure it's in your party and walk around with it for a few minutes (it may take longer but probably will hatch within an hour). It'll hatch in half the time if you have Hitomoshi (Litwick) in your party.

Answer 3

Run around for excessive amounts of time [b] WITH [/b] the pokemon in your party.