PK Fire is a Special Move in the Super Smash Bros. video game series. It is a projectile attack performed by the Standard Special combination in the original Super Smash Bros., and by the Side Special combination in the rest of the Super Smash Bros. installments. PK Fire can be used in Super Smash Bros. by Ness, Super Smash Bros. Melee by Ness, Super Smash Bros. Brawl by Ness and Lucas, and Super Smash Bros. for Nintendo 3DS/Wii U by both Ness and Lucas once again.
When performed on the ground, a flare travels in a straight line until it hits an opponent or destructible portion of the stage. If within traveling a few feet the flare does not hit a target, it disappears. If the move hits an airborne target, the pillar of fire falls downwards.
In all games of the Super Smash Bros.series, Ness's PK Fire explodes into a pillar of fire that hits an opponent multiple times, which can lead to potential combos while the enemy is stunned. Ness can also launch his PK Fire diagonally downwards if he uses the move in the air. Lucas's version of this move shares differences from Ness' version. Lucas's PK Fire always travels horizontally. When the flare hits an opponent, it hits once, and deals them fair knockback. When Lucas's PK Fire and a double jump is executed at the same time, Lucas gains a huge vertical boost.
- In EarthBound and Mother 3, this move is not realized by Ness and Lucas, but by Paula Polestar and Kumatora respectively. A possible explanation for this discrepancy is offered in Super Smash Bros. Melee and Super Smash Bros. Brawl, which states that Paula and Kumatora have taught each of them the technique for their appearances in the Super Smash Bros. series.