Reverses any stat changes affecting the Pokémon so that attempts to boost its stats instead lower them—and attempts to lower its stats will boost them.

The Japanese name of this ability, "Amanojaku", is the name of a small oni-like demon that instigates humans to act upon their darkest compulsions and turn to evil, and will always lie or state the opposite when interrogated. The name is used in common language to mean "contrarian" or "backwards"