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 37.
Level 30.
level 28
Level 30.
Level 18.
Level 26
Level 25
at level 40 it should evolve into drapion
you have to evolve it with a water stone
Donphan doesn't evolve.
Spiritomb doesn't evolve.