PK Flash is Ness' Neutral Special Move from Super Smash Bros. Melee onwards. When the move is initiated, a sphere of green light appears above Ness. As the B button is held, the ball of light moves downwards and increases in power, until the B button is released, or until it is fully charged, at which point it explodes with very high lethality. The ball of light is arguably easier to control in Brawl than it is in Melee, it can only be controlled sidewards.