PK Fire

PK Fire (called PSI Fire in the English version of Earthbound) is a special move that can be performed by Ness. It is done with forward-B, and is a projectile attack. When performed on the ground, It travels in a straight line until it hits an enemy or destructible portion of the stage. If it does not hit either of the aforementioned objects within a few feet, then it disappears. When it hits, it creates a pillar of fire that blocks the enemy from passing through it. It can also be done from the air, which causes it to move in a diagonal fashion, similar to Sheik's needles.

In Earthbound, the attack is actually not learned by Ness (Something Paula's Trophy in Melee explains). It is described as a wave of fire shot from the fingers and is capable of damaging rows of enemies.