PK Starstorm is the Final Smash of both Lucas and Ness in Super Smash Bros. Brawl. The character summons a rain of meteors from the sky, which strike the stage. The move is more effective on smaller stages. The move differs slightly for the two characters whom use it; Lucas' meteors rain downwards in parallel lines, dealing 14% damage, whereas Ness' meteors spread out in a "fan-like" shape, dealing 20% damage.
Neither Lucas nor Ness actually learn PK Starstorm in their respective games. PK Starstorm is used by Poo (EarthBound) and Kumatora (Mother 3); however, this is not the first time PSI attacks have been "borrowed" in the Super Smash Bros. series, as both Lucas and Ness use PSI moves that they do not learn in their respective games.