"This is Nature Power, which deals damage of different types based on the given data. The one I used just now was a Persim Berry!"
Chén Nuò explained to Sanji that the damage dealt by Nature Power was of the Ground-type, and an Aron, with its Rock and Steel types, simply couldn't withstand that blow.
As you could see, that single shot of Nature Power had practically scrambled the fellow's brains—just look at him now, with his head planted straight in the dirt!
Chapter 65