PK Starstorm

PK Starstorm is the Final Smash of both Lucas and Ness in Super Smash Bros. Brawl. The character summons a rain of actual stars from the sky (or astronomically seen, meteorites) while yelling "PK... Starstorm!!", which strike the stage. Lucas' PK Starstorm is more effective on smaller stages, while Ness' PK Starstorm is more effective in larger stages.

Ness
Ness' meteors come down individually and spread out in a fan-like shape, dealing 20% damage. Ness' PK Starstorm knocks the opponent vertically.

Lucas
Lucas' meteors swarm in groups, raining downwards and slightly inwards, dealing 14% damage. Lucas' PK Starstorm knocks the opponent horizontally.

Ness
''Ness as he calls down a host of damage-dealing stars in his Final Smash. Everyone on the screen must dodge like crazy to avoid getting hurt, but that's no easy task. This attack appeared in the MOTHER series, but it was Poo, not Ness, who wielded it. Perhaps Poo taught Ness the secret of the attack for use in Super Smash Bros. Brawl.''

Lucas
''Lucas' Final Smash. He pulls a large group of stars from the sky and sends them smashing down among his enemies, causing damage to one and all. In MOTHER 3, this move was used by Lucas' traveling companion, Princess Kumatora. As Ness learned this move from Poo, Princess Kumatora taught Lucas when he learned he would appear in Super Smash Bros. Brawl.''

Origin
This move has its origins in the game Earthbound (MOTHER 2 in Japan), being a very powerful attack that affects all enemies on the screen. In this game, it is used by a character named Poo (one of Ness' partners). It also appears in MOTHER 3, being used by Kumatora (one of Lucas' partners in said game). However, like most of both Lucas' and Ness' attacks in the Super Smash Bros. series, they do not learn this attack on their respective games. Interestingly, in their Final Smash Trophies, it is hinted that Poo and Kumatora taught this attack to Ness and Lucas respectively to use in Brawl.