Ness using PSI Rockin α against Mr. Frank.
PSI Rockin (PK Kiai) is a fictional PSI ability in the 1995 video game 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 final battle. At its Ω level, its power is rivaled only by PSI Starstorm Ω.
Like the four main characters, King and Ness' favorite food, PSI Rockin can be given a unique name by the player, when asked what the player's favorite thing is before the story begins.
In EarthBound
| Level | Users | PP Cost | Target | Effect | Comments | Description |
| α | Ness | 10 | To all enemies | Deals 40 - 120 damage | Ness' special PSI that is named for his favorite thing. It effects all enemies on the battle screen and decreases one enemy's Psychic Shield strength by 1. | A deadly PSI attack which only Ness can use. It's a psychokinetic wave generated by concentration that deals each enemy about 50 points of damage. |
| β | Ness | 14 | To all enemies | Deals 90 - 270 damage | Ness' special PSI that is named for his favorite thing. It effects all enemies on the battle screen and decreases one enemy's Psychic Shield strength by 1. | A deadly PSI attack which only Ness can use. It's a psychokinetic wave generated by concentration that deals each enemy about 180 points of damage. |
| γ | Ness | 40 | To all enemies | Deals 160 - 480 damage | Ness' special PSI that is named for his favorite thing. It effects all enemies on the battle screen and decreases one enemy's Psychic Shield strength by 1. | A deadly PSI attack which only Ness can use. It's a psychokinetic wave generated by concentration that deals each enemy about 320 points of damage. |
| Ω | Ness | 98 | To all enemies | Deals 320 - 960 damage | Ness' special PSI that is named for his favorite thing. It effects all enemies on the battle screen and decreases one enemy's Psychic Shield strength by 1. | A deadly PSI attack which only Ness can use. It's a psychokinetic wave generated by concentration that deals each enemy about 640 points of damage. |