PSI Rockin (known as PK Kiai in the Japanese version) is a PSI ability in EarthBound. It works on all enemies and has the possibility of decreasing one of the targets' Psychic Shield strength by 1. PSI Rockin is realized in EarthBound by Ness, and is also used by Giygas in the game's final battle. Ness's Nightmare is also capable of using the attack. At its Ω level, its power is rivaled only by (to an extent) PSI Freeze Ω.