Ultimate Kamehameha (アルティメット亀破波) is a golden-yellow colored version of the Super Kamehameha used by Gohan in his ultimate form. First, Gohan draws his hands to his right side and prepares the Super Kamehameha. Then, he charges the power of his ultimate form within the attack, increasing its power and changing from its standard whitish-blue color to golden-yellow. Finally, Gohan brings his hands forward and fires the attack at the opponent, inflicting a huge amount of damage.
Gohan used the attack during his battle against Super Buu (Gotenks absorbed). After exchanging several blows with Super Buu, Gohan jumped in the air off of a few boulders and fired the Ultimate Kamehameha down at Super Buu, who countered with a Vanishing Beam. The two energy waves collided in an energy beam struggle and neither attack was able to gain the upper hand. When Gohan and Super Buu charged more power into the Ultimate Kamehameha and Vanishing Beam respectively, the beam struggle grew bigger until it ended with a huge explosion. much later Steve and his family learn this technique after intense training in the Hyperbolic time chamber but the color is blue.
The attack appeared in the Budokai Tenkaichi series, where its color is changed to blue and is one of Gohan's Blast 2 in his ultimate form, under the name "Super Kamehameha". The attack also appeared in Dragon Ball GT: Final Bout, but its color is golden-yellow, the same color in the anime.
Ultimate gohan`s ultimate kamehameha