The user yells "PK... STARSTORM!", calling forth a rain of meteors ("shooting stars") which pass through the stage striking any opponents in their way.
PK Starstorm (localized as PSI Starstorm in EarthBound) first appeared in EarthBound and later appeared in Mother 3. In both games, the move involves using the character's psychic power to send down stars on enemies. However, in both games, neither Ness nor Lucas learn the move; instead the move is taught to their friends Poo and Kumatora respectively in story events. Brawl explains the inconsistency in both Ness' and Lucas' PK Starstorm trophies, saying that they were taught the moves by their friends specifically for Smash. Super Smash Bros. Ultimate offers a new explanation by having Ness and Lucas summon Poo and Kumatora respectively during the animation.
In the description for the move in EarthBound, it states that the move uses a method of "shaking off the stars". In EarthBound, PK Starstorm can deal between 270 and 900 damage, and is available in both "α" and "Ω" tiers of increasing strength (the latter only becoming available during the last stretch of the game). In Mother 3, the move can deal between 650 and 680 damage and only comes in a single, unlabeled tier. Also, in both games, the move is impossible for any target to dodge, but it can be reflected by sufficient PSI shields; this behavior does not translate into Smash.
The move differs slightly between the two characters who use it. Lucas' meteorites are yellow, rain down in groups which point slightly inwards, and deal 14% damage each, knocking the opponent sideways. Ness' shooting stars are blue, spread out individually in a fan-like shape, and deal 20% damage each, knocking the opponent upward.
These differing properties, particularly the meteorites' direction of travel, favor Lucas's version on smaller stages while making Ness's version more effective on larger ones. Due to the meteors' randomness, there can be times where they can be easily dodged or even avoided without having to move at all. Getting hit by even one meteor, though, is likely to cause the victim to be hit by many others, causing heavy damage and a likely KO.
PK Starstorm received notable changes, which apply to both of its users: it no longer covers the whole stage, but consists of a fast stream of meteors which covers a small range and whose direction can be adjusted with the control stick/circle pad, similar to Aura Storm. While a powerful attack, its small horizontal range creates blind spots. The meteors now deal flame damage, and during the attack the PK Starstorm sound effect from EarthBound plays. Between Ness and Lucas, both versions of the attack now function identically in terms of control, appearance, and damage output (including both characters having blue meteors).
The meteors are now slower and move in more erratic patterns. Paula and Poo join Ness, while Kumatora and Boney join Lucas. The meteors in Ness's PK Starstorm travel in a general pattern that spreads out over the stage, while Lucas's meteors fly inwards towards the center. Both variations now feature the PK Starstorm sprites from the home series, and the background resembles the one used for the Eight Melodies screen in Earthbound.
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' 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.
In EarthBound, this PSI ability belonged to Poo, the crown prince of Dalaam and one of Ness's friends. Ness must have learned it especially for Smash Bros.! The attack makes a shower of meteors fall onto the stage, damaging any foes it hits. While the attack's in progress Ness is invincible and can adjust the meteor's trajectory.
You can adjust the direction of the stars in this attack! Rain stars down on multiple fighters, or be mean and pick on a single fighter. The choice is yours! If a star connects, it will deal ongoing fire damage, making it hard for opponents to return to the stage.
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