PK Starstorm

PK Starstorm is Ness' Final Smash in Super Smash Flash 2. Ness uses his PSI powers to make psychic comets fall from the sky, which can do 20% of damage if they connect with an opponent. Unlike in SSBB, where the comets fan out in an inverted "V" shape, the comets in SSF2 fall in random directions but still span the entire arena, making it more likely to KO a player than it is in Brawl.

Origin
The origin of PK Starstorm comes from Earthbound (JP: Mother 2) where it is actually learned by Ness' companion Poo, a prince from Dhlaam and not Ness himself. However, in the description of the PK Starstorm for Ness in Brawl, it is hinted Poo teaches Ness this attack.