Ness using PSI Rockin α against Frank.
PSI Rockin (PK Kiai) 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 PSI Starstorm Ω, PK Love Ω(appears in Mother 3 rather than Earthbound), and (to an extent) PSI Freeze 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.
Unlike PK Love, it has no out-of-battle effect. But it, when used, displays a lot of harsh lights and loud sounds. The power depends on the level of PSI Rockin selected.
In EarthBound
| Level | Users | Level | PP Cost | Target | Effect | Comments | Description |
| α | Ness | 8 | 10 | To all enemies | Deals 40 - 120 damage | Ness' special PSI that is named for his favorite thing. It affects 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 80 points of damage. |
| β | Ness | 22 | 14 | To all enemies | Deals 90 - 270 damage | Ness' special PSI that is named for his favorite thing. It affects 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 | 49 | 40 | To all enemies | Deals 160 - 480 damage | Ness' special PSI that is named for his favorite thing. It affects 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 | 75 | 98 | To all enemies | Deals 320 - 960 damage | Ness' special PSI that is named for his favorite thing. It affects 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. |
Trivia
- Using the Don't Care naming option, possible names for PSI Rockin (or, "your favorite thing") are "Rockin", "Hammer", "Love", "Gifts", "Slime", "Gaming", and "Boxing".
- Before Pokey turns off the Devil's Machine, Giygas can use this move.
- It was mistranslated as PSI Rockin. It should in fact be PK Rockin as it is an offensive PSI.
- One of the default names for PK Rockin is PK Love, which is the name of the special attack that only Lucas can use in Mother 3.
- Some names for yor favorite thing may be more around making it sound like more of an attack instead of something you enjoy.