PK Starstorm

PK Starstorm is a PSI attack, introduced in EarthBound. It is a powerful attack, only taught manually to those who have earned it.

In EarthBound


Poo leaves the party temporarily with the Star Master to learn PK Starstorm α after they exit the pyramid in southern Scaraba, and later comes back with his new power in the middle of a fight against Master Barf in Deep Darkness. He gains PK Starstorm Ω at the Cave of the Past shortly before the party is turned into robots and transferred back in time to defeat Giygas.
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PK Starstorm α

 * Starman Deluxe
 * Ghost of Starman
 * Final Starman

PK Starstorm Ω

 * Ghost of Starman
 * Final Starman

In Mother 3
Kumatora is taught PK Starstorm by Ionia right before Lucas pulls the needle at Chupichupyoi Temple.
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In the Super Smash Bros. series
PK Starstorm becomes Ness's and Lucas's final smash in this game. According to trophy information, Ness was taught the move by Poo and Lucas was by Kumatora. Possibly due to this, Lucas's PK Starstorm is differently shaped than Ness's. The move has many meteors falling in random areas of the screen, doing a big amount of damage to those hurt.

Super Smash Bros WiiU/3DS
It is though unclear if PK Starstorm will return as Lucas's Final Smash, but Ness still has it and can now control it.