Nature Power is a Normal-type move. Its move varies depending on the climate and the place you are.
In Tall Grass and inside buildings, such as Gyms, Nature Power turns into the attack Swift.
In tunnels, Nature Power turns into the attack Shadow Ball.
On beaches, Nature Power turns into the attack Earthquake.
The moves it turns into are: Stun Spore, Swift, Razor Leaf, Earthquake, Shadow Ball, Rock Slide, Surf, and Hydro Pump.