Natu elvolves at lvl. 25.
You have to evolve it from natu at level 25. Natu can be found in the ruins of Alph. The ruins of Alph is west of violet city in the Johto region. Hope I helped!
Level 30.
Level 30.
level 28
Level 25
Level 37.
Level 18.
Level 26
at level 40 it should evolve into drapion
Spiritomb doesn't evolve.
Donphan doesn't evolve.
you have to evolve it with a water stone