You cannot catch Natu in Pokemon Black. You will have to trade for one or transfer one from a DS Series game.
Chat with our AI personalities
You can find Natu on route 224 I think. Natu evolves into Xatu at around lv 25. Good luck!
You can get natu at the ruins of alph in heart gold and soul silver
you find him in the ruins of alph by weeds and you can find smeargle on there same thing on Pokemon heart gold (natu evolves at level 25)(smeargle no evolvetion)
You can find one in Solar Cave.
You can get natu and xatu (the evolved form of natu) in the safari zone near fortree city