PK Beam is Ninten's Neutral Special move in SSBTUF. Ninten launches a beam of energy from his fingertips. You can charge this to make it more powerful. Charging 1-3 seconds is weak, 4-6 seconds is medium power, 7 seconds is one-hit Ko and 8-10 seconds is very powerful.
PK Beam is a PSI attack that appears in Mother. It is learned by one of Ninten's friends, Ana. In this game, it has four ranks: α (Alpha), β (Beta), γ (Gamma) and Ω (Omega). Alpha is weak, Beta is stronger, Gamma is an instant kill and Omega is very powerful. This is why charging the attack to almost full power in SSBTUF makes it a one-hit KO.