try anywhere from level 35-40 Banette doesn't evolve into duskul....Shuppet evolves into Banette and Duskul (which you can get at mt. Pyre.) evolves into cyclops shuppet doesn't evolve into duskull. only banette
Evolve a shuppet. Find a shuppet at mt. Pyre (ground level). You can also get 'em in the route that is west of lillycove city. I don't remember what that route is called. You need to get it to lv. 38 for it to become a banette.