Percheif is the evolved forme of Xatu, a Cheif Pokémon. Percheif is said to evolve when a Xatu reacts to a Sun Stone. The Xatu's stats literally switch, in that its Attack becomes it's powerhouse and Special Defense it's wall.
They are able to predict an opponent's next move by thinking of over 50 possible outcomes. They guard trees where the Xatu elders and Natu young live so they can grow.
Other Information 
|Items for Evolution:||Engligtenment Dust|