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PK Fire is a PSI attack appearing in every installment in the MOTHER / EarthBound series and as a special attack used by Ness and Lucas in the Super Smash Bros. series. In the original Super Smash Bros. it is Ness's neutral special move; since Super Smash Bros. Melee, however, it is the side special move of both Ness and Lucas, Ness gaining PK Flash as his new neutral special move. When used, Ness and Lucas throw a bolt of lightning from their fingertips, Ness's traveling at a downward arc, while Lucas's travels directly forward, but it pushes him back a set distance. In addition, when Ness uses PK Fire in the air, the bolt travels at a greater downward arc than on the ground. The attacks upon hitting something are also different; Ness's creates a pillar of fire that deals continuous damage until it disappears, while Lucas's bursts into a fire that hits once.
In Super Smash Bros. for Nintendo 3DS / Wii U, Ness is given two custom variants for this move. The first is PK Bonfire, which fires a bolt of lightning that does not travel as far or as fast, with higher start-up and ending lag, but the fire it creates upon hitting lasts longer and has more upward knockback. The second is PK Fire Burst, which behaves similarly to Lucas's PK Fire; this move has more start-up lag than normal PK Fire.
Ness also uses PK Fire for his down throw, though in Super Smash Bros. for Nintendo 3DS / Wii U, the fire is absent.