The Three Successfully Transform

Vegeta created an Artificial Moon, tossed it into the sky, and looked up at it.

"Thump-thump, thump-thump."

As Vegeta's heart hammered violently, his body rapidly expanded, transforming into a massive, golden Great Ape.

Goku and Gohan peered through the window glass, catching sight of the Great Ape's gargantuan frame.

The Great Ape Vegeta stood there, motionless.

Goku whispered to Gohan, fearing the Great Ape Vegeta might overhear, "Did it not work?"

"I don't know either. I've never seen the transformation into Super Saiyan 4; Uncle Gogito always transforms instantly."

Gohan whispered back.

Suddenly, the Great Ape Vegeta reacted. Golden energy erupted from the giant, terrifying bolts of lightning crackling around him. His body began to shrink, condensing into a smaller, humanoid ape. The smaller ape let out a deafening roar, "Yaaah!!!"

Golden light radiated from his entire body, the terrifying power shattering the very space around him until the entire Lookout trembled.

Vegeta had successfully transformed.

Super Saiyan 4 Vegeta appeared, clad in leather pants, a belt, and gloves.

Goku and Gohan stared in awe. Was this the transformation process of a Super Saiyan 4? It was breathtaking!

Vegeta raised his hand to retract the Artificial Moon and said to Goku, "Do you want to test the power of a Super Saiyan 4, Kakarot?"

Vegeta simply wanted to give Kakarot a beating.

Goku, being who he was, agreed on the spot.

Goku immediately transformed into a Super Saiyan 3 and charged, landing a heavy punch squarely on Vegeta's face.

Vegeta stood his ground; despite the strike to his face, it had no effect. He remained as steady as a mountain, not even budging.

Goku unleashed the Wolf Fang Fist, "Atatatatatata~"

A rain of punches struck Vegeta rapidly, followed by a fierce kick to his chest.

None of these attacks could shake Vegeta's body.

Goku retreated quickly, assuming the stance for the Kamehameha. He unleashed a full-power Super Saiyan 3 Kamehameha, which slammed into Vegeta.

"Boom~~"

Goku's full-force Kamehameha hit Vegeta, the explosion kicking up a thick cloud of smoke.

However, as the smoke cleared, Vegeta's figure was revealed, still completely unscathed.

"My turn to attack, Kakarot!"

Vegeta's lips curled into a wild grin as he vanished from his spot, reappearing right in front of Goku.

Goku's eyes widened.

"What!?"

Vegeta also unleashed the Wolf Fang Fist, but these were no longer a rain of punches; they were meteor-like blows slamming into Goku. Goku could only take the beating, unable to even track Vegeta's movements.

Vegeta landed an uppercut, sending Goku flying into the air, then flashed above him, clasped his hands together, and brought them down with a crushing blow.

"Bang!"

Goku slammed into the ground like a cannonball, creating a massive crater and reverting to his base form.

Vegeta landed steadily at the edge of the crater, feeling immensely proud. That guy Kakarot had finally been defeated at his feet.

Goku stood up and said, "That is truly exaggerated power, Vegeta!"

Gohan pulled out a Senzu Bean he had obtained from Korin and tossed it to Goku.

"Dad, here is a Senzu Bean I got from Korin."

Goku caught the Senzu Bean and ate it, instantly recovering to full strength.

"Next, it's my and Gohan's turn to try transforming, Vegeta."

Vegeta raised his hand to create an Artificial Moon and tossed it into the sky. Goku looked up at the moon, while Gohan hid to the side, keeping his head down to avoid looking at it.

Goku successfully transformed into a Golden Great Ape, though it was clear he had lost his reason.

"As expected, a low-class warrior like Kakarot has no way to control his own mind."

The Great Ape Goku opened his mouth and fired an energy beam into the distance, causing a massive explosion. The Great Ape Goku then turned his gaze toward the only building, the exit of the Hyperbolic Time Chamber. Just as he opened his mouth, Vegeta landed a Rising Dragon Punch to his chin, dissipating the energy instantly.

"Kakarot, since you've lost your mind, let me beat some sense into you!"

Vegeta began his assault, trash-talking as he fought, regardless of whether the Great Ape could understand him.

"What's the matter, Kakarot, is that all you've got?"

"Kakarot, your speed is lacking!"

"Kakarot, is this the extent of your power?"

Vegeta vented the resentment he had harbored for years; he had always been one step behind Kakarot, always just a hair's breadth away from defeating him.

As they fought, Great Ape Goku suddenly reacted and froze in place.

"It's coming!"

Vegeta retreated to the side, watching Goku transform.

The same process repeated itself with Goku, and finally, Super Saiyan 4 Goku emerged.

"Thanks, Vegeta."

Super Saiyan 4 Goku's first words were to thank Vegeta.

But being the tsundere he was, Vegeta would never admit he was helping Goku, stubbornly retorting, "I just wanted to understand how powerful the strength of a Super Saiyan 4 truly is."

Goku didn't call his bluff, instead turning to shout at Gohan, "Gohan, it's your turn."

Gohan began his transformation as well, yet he did not lose his reason. Perhaps it was due to Gohan's incredibly high state of mind, the accumulation of knowledge over the years, the insights gained from books, and Gohan's own inherent potential that forged this peerless warrior.

Gohan successfully transformed into a Super Saiyan 4, and the aura radiating from him was clearly stronger than that of both Goku and Vegeta.

"That's amazing, Gohan! You didn't lose your reason, and your ki is even stronger than mine and Vegeta's!"

Goku grew excited once more.

The three of them prepared to continue their training within the Hyperbolic Time Chamber to consolidate their Super Saiyan 4 states.

As for Gogito, he stepped into the space-time rift, heading toward the GT Timeline.

Somewhere on Earth in the GT Timeline, Gogito and Tights emerged from the rift. The two looked around at their surroundings; well, they had no idea where they were!

Looking up, a massive planet hung near Earth. Gogito instantly realized that the timeline was still in the Baby arc.

Suddenly, a ki blast flew from Planet Tuffle, aimed directly at the Earth beneath Gogito's feet.

Baby was using the Earth to threaten Super Saiyan 4 Goku, forcing Goku to take his attack head-on.

Gogito raised his hand slightly and blocked the ki blast.

Goku and Baby on Planet Tuffle were somewhat surprised; there was still a powerhouse on Earth capable of blocking Baby's attack?

However, Goku couldn't be bothered with that now. The rage in his heart could no longer be suppressed. He flashed in front of Baby, shielding the Earth, and quickly gathered a 10x Kamehameha in his hands, firing it fiercely at Baby.

When the smoke cleared, Baby was completely unharmed.

"How is that possible?"

Super Saiyan 4 Goku couldn't believe that his strongest ultimate technique had been useless against Baby.

Baby laughed wildly, "It's useless, I am invincible."

He immediately struck a Galick Gun pose and blasted Super Saiyan 4 Goku with all his might. Super Saiyan 4 Goku had no time to dodge and took the terrifying blow head-on, collapsing to the ground, unable to rise.

Baby moved to deliver a finishing blow, but suddenly his body exploded. The 10x Kamehameha from moments ago had taken effect, and Baby collapsed beside Super Saiyan 4 Goku; both were left incapacitated.

(Thanks to everyone for the tips)