Train it to level 30.
A Natu can evolve at Level 25 into an Xatu.
It should evolve.
Natu evolves into Xatu at level 25.
Natu evolves at level 25.
Natu elvolves at lvl. 25.
Xatu is the final form of Natu, and doesn't evolve
Lv. 25
Natu evolves into Xatu at level 25.
level 27
you have to evolve natu at lv.54
around 25
Natu evolves at level 24