First, Gohan raises his hands above his head and charges streaks of yellow energy around his hands. Then, he puts his hands forward and forms a white energy sphere. Finally, Gohan fires a huge golden-yellow shockwave of energy from the energy sphere against the opponent, inflicting a massive amount of damage.
Gohan uses this attack during his battle against final form Frieza on Namek. While stalling Frieza until Planet Namek's explosion, Gohan senses that his father is still alive after he was earlier knocked into the ground. Enraged, Gohan powers up and yells at Frieza "You hurt my dad! You killed my friend!", which surprises Frieza. Then, Gohan charges at Frieza and knocks him to the ground with a barrage of punches and kicks. Gohan follows up by blasting Frieza with the Ultimate Masenko, creating a huge explosion. However, Frieza emerges from the blast unharmed, but before he was about to kill Gohan, Goku rises up into the air and Gohan flies away to Goku's spaceship while his father finishes the battle with Frieza.
Appearances in games
Ultimate Masenko is named in Dragon Ball Z: Burst Limit and Dragon Ball Z: Infinite World, where it appears as Kid Gohan's ultimate attack in his Unlock Potential form. It is called Magekisenkoudan in Dragon Ball Z: Supersonic Warriors 2, where it is Gohan's Ultimate K.O. in his base and Super Saiyan forms. It is a skill named Charged Masenko and learned by Warrior-type Namekians at level 18 in the computer game Dragon Ball Online.