Dragon Fist

Dragon Fist (龍拳, Ryūken), also known as Dragon Fist Explosion (龍拳爆発, Ryūken Bakuhatsu), is an incredibly powerful attack developed by Goku. This technique is capable of destroying foes much more powerful than Goku himself.

History
Goku begins the attack by making a straight fist faced at his enemy, and charges him. Then once his fist, along with his own body, exits the stomach or chest of the target, the energy will be amplified massively compared to Goku's normal power and his ki will explode out in the form of an enormous golden dragon (referred to as "golden, shining dragon") which bears a great resemblance to Shenron and then finally collides into the target, possibly destroying the opponent in its path or leaving a gaping hole, hence the name "Dragon Fist".

Goku first uses it as a Super Saiyan 3 against Hirudegarn,[7]and he later uses it in his normal form against Super 17,[8] and in his Super Saiyan 4 form against Eis Shenron[9] and Omega Shenron.[10] The technique directly kills Hirudegarn, mortally wounds Super 17 (allowing Goku to vaporize the evil Android by firing a Kamehameha at him), and obliterates Eis and Omega Shenron (though Omega Shenron regenerates).

Goku's usage of the Dragon Fist in the Super 17 Saga of Dragon Ball GT shows that the move's origins might hail from the first Dragon Ball anime and might be an updated version of the Penetrate! technique Goku uses to kill King Piccolo. The execution of the move is virtually identical to the Penetrate! move, minus the initial Kamehameha and, instead of a silhouette of a Great Ape, a golden dragon appears as Goku's inner powers.

The "Super" Dragon Fist appears when Goku kills Eis Shenron as a Super Saiyan 4. Goku punches through the Shadow Dragon, immobilizing him and making him fall at Goku's feet. Then, Goku punches Eis in his back, erupting in a brutal explosion with the Super Dragon. This method of the attack is Goku's Ultimate Blast in his Super Saiyan 4 form in Dragon Ball Z: Budokai Tenkaichi 3. In this version, Super Saiyan 4 Goku strikes a fighting pose before dashing instantly at his foe and kicking him into the air. Then, he proceeds to deliver a brutal punch to the gut, which makes the target drop to the ground. Finally, Goku charges the Dragon Fist and strikes the foe's back with it summoning the huge dragon with an aura of flames around it. After the dragon circles the skies it then comes crashing down onto the enemy, inflicting a massive amount of damage.

Goku later uses a combination of the 10x Kamehameha and Dragon Fist to ensnare and then blow apart Omega Shenron.[10] It seemed that the attack defeated the mighty Shadow Dragon, but he was able to regenerate due to possessing Rage Shenron's regeneration ability.