It evolves at lvl 25, unless you caught it at a higher lvl, then just one level is needed.
A Natu can evolve at Level 25 into an Xatu.
it evolves on level 54--------------------------------------Natu evolves into Xatu at level 25.
Xatu is the final form of Natu, and doesn't evolve
Natu evolves at level 25 into xatu Mine evolved at level 27 into xatu
Natu evolves to Xatu at 25. Xatu is the final evolution.
Natu evolves into Xatu at level 25.
you have to evolve natu at lv.54
It evolves at level 25.
Natu evolves into Xatu at level 25.
If you mean what does Natu evolve into, that would be Xatu at Lvl. 25 :]
There is no way to get it (at least at Pearl), but you can migrate it from Pokemon Ruby, Sapphire and Emerald and maybe LeafGreen and FireRed. Or you can migrate Natu.
in ruby, saphire, and emerald, you get it from the safari (or evolve ith from natu which is also in the safari).