You could catch fraxure (both have to be opposite genders) evolve both and take them to the Pokemon day care and there you go! one axew egg.
You could get a ditto ( you can get one in both black and white) and have one fraxure and that them to the day care center!
Or you can catch Axew in Mistralton Cave and breed them using methods mentioned above.
My personal view is using a ditto is far easiest as you dont have to worry about genders of axew / fraxure etc, and you can just keep a ditto in daycare all the time.
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You can evolve an Axew at level 38
Axew evolves to Fraxture at level 38.
mistralton cave
you can breed axew cause you can breed any pokemon
Well in the pokemon black and white show,(on cartoon network)she said she is not going to evolve axew.So i bet in the game,(pokemon black and white)she is probably not going to evolve axew.So dont worry.But if axew does evolve,then iris lied.