At that time, he broke the limit and mastered the Super Saiyan beyond the Fourth Stage by absorbing the Power of Gohan, Goten, Oob, and Trunks in their adult forms.
But that method probably won't work in this era.
Not to mention that Oob in this era is only a few years old, even with the Power of Vegeta, Trunks, Goten and Gohan, it probably wouldn't be enough to fill half of his body.
In Super Saiyan 4 form, the amount of energy that can be stored in his body is enormous, and even he himself doesn't know where the limit is.
"This is really a headache. If this method doesn't work, I can only use other methods,".
"If I want to surpass the limit in a very short time, there seems to be no better way than to enter the Hyperbolic Time Chamber to practice.".
Goku felt very distressed.
Frankly speaking, entering the Hyperbolic Time Chamber for training is not the best choice. First of all, the environment there is harsh. Training alone in there is not only inefficient, but also can't last long.
Unless you can find like-minded people to enter the Hyperbolic Time Chamber together for training.
Several figures flashed through Goku's mind.
Gohan?
That probably won't work. Until now, this kid is still busy with his studies. Even if he promised to train, he only does some simple exercises occasionally to ensure that his Power doesn't regress.
It's probably impossible to get him to enter the Hyperbolic Time Chamber with me again for training.
Goten?
This thought was just emerging when Goku dismissed it. First of all, there's the issue of Goten's age. If Chi-Chi found out about this. . . The consequences would be unimaginable.
A good scolding would definitely be unavoidable.
As for the other partners, Yamcha, Krillin, Tien Shinhan, Vegeta, and Piccolo.
The first three can be directly ignored. According to the current situation, the possibility of inviting them to train together is small.
After thinking about it, there are only two good candidates, Vegeta and Piccolo.
Regarding Vegeta, Goku wasn't sure if he would follow him into the Hyperbolic Time Chamber to train, after all, although the relationship between the two was not bad, they had never worked together in training.
If he took the initiative to invite Vegeta to train, he might be rejected.
After continuous elimination, of all the people he knew, the only person who seemed to be able to go to the Hyperbolic Time Chamber to train with him was Piccolo.
"Should I go to Kami's Lookout now to invite Piccolo to train in the Hyperbolic Time Chamber?" Goku muttered to himself.
At the same time, he had a new plan in mind, going to the Hyperbolic Time Chamber to train just like that seemed like a waste of this opportunity.
But if he didn't go to the Hyperbolic Time Chamber, breaking the current limit would take a lot of time.
Just as Goku's thoughts were running wild, an elderly figure suddenly flashed in his mind.
Supreme Kai.
It was he who had unlocked Gohan's potential back then, greatly increasing Gohan's strength to the point where it even surpassed his Super Saiyan 3.
Furthermore, when Gohan was unable to defeat Majin Buu, Supreme Kai even shared part of his lifespan with him, allowing him to return to the human world.
"That's right! There's also Supreme Kai! He was the one who helped me pull out my tail back then, maybe he knows how to improve my Super Saiyan 4!" Goku immediately decided to visit Supreme Kai in the Supreme Kai's world.
Looking at the entire Universe, it seems that only Supreme Kai can help him improve his strength.
Soon, with a thought, Goku quickly Lock-On to the location of the Supreme Kai's world through perception, sensing the ki of the Supreme Kais.
The Power of gods is completely different from the ki of humans. Generally, mortals cannot sense ki.
But some mortals who are too strong are an exception.
If it were the present Goku, his realm would not be high enough to even sense the ki of the Supreme Kai, let alone reach the Supreme Kai's world through Teleport.
But now the person dominating this body is GT Goku, who was already familiar with the ki of the Supreme Kai in his previous life.
With his right hand forming a sword finger on his forehead, Goku's vast perception expanded, crossing dimensions to Lock-On to the ki of the Supreme Kai.
With a thought, Teleport was activated.
Supreme Kai's World.
As the sacred land where Supreme Kais of all ages have lived, its environment is hard to find a lower realm Planet in the entire Universe that can compare.
Currently, the Universe is at peace, and there have never been any upheavals.
The idle Kibito Kai and Supreme Kai are whiling away their time.
Kibito Kai uses his abilities to observe the newly born Planets in the lower realm, observing the creatures on these Planets and their future development potential.
The Supreme Kai is the same, but the Supreme Kai doesn't know what he saw, his old face showed a lewd smile, and he kept shouting: "That's it, a little lower! A little lower!".
This scene happened to be seen by Kibito Kai next to him.
Seeing his ancestor so excited, and coupled with his understanding of the Supreme Kai, Kibito Kai immediately had the wrong idea.
"Ancestor, as gods, we can't do this kind of thing." Kibito Kai stood in front of the Supreme Kai, and said righteously.
Seeing Kibito Kai blocking him and saying things he couldn't understand, the Supreme Kai Leer and said unhappily, "You brat, get out of the way! The moment to decide the outcome is coming!".
"Decide the outcome?" Hearing this, Kibito Kai was stunned for a moment, and subconsciously turned his head, following the Supreme Kai's gaze.
On a distant Planet, two beetles were dueling on a tree, and one of them had been overturned, declaring the victory or defeat of the duel.
"Seriously, it lost after all." Seeing the beetle he valued being overturned, the Supreme Kai said with a lost look, and at the same time, he slightly glanced at Kibito Kai next to him, and added: "I say, you brat, you wouldn't be thinking too much, would you?".
"That. . . That. . . The weather is really nice today. . ." Kibito Kai's expression was awkward, and he hurriedly changed the subject.
Seeing this, the Supreme Kai narrowed his eyes slightly, Making Kibito Kai feel guilty.
Just then, there was a ripple in space.
A 'whoosh~! !' sound of breaking through the air rang out.
Goku appeared out of thin air between the Supreme Kai and Kibito Kai.
"Goku? !" X2.
Goku's sudden appearance caused both the Supreme Kai and Kibito Kai to exclaim in surprise.
The Supreme Kai was extremely surprised by this. He never expected Goku to be able to reach the world of the Supreme Kais on his own.
Although there was a previous lesson, Gohan was in the world of the Supreme Kais at that time, and Goku sensed his energy and Teleported over.
But now, in this vast world of the Supreme Kais, there are only him and Kibito Kai, no mortals.