The next day, Vegeta showed up for training with dark circles under his eyes, leaving Great Goku staring at him in bewilderment.
"Vegeta, what were you doing last night? Why do you look so listless?" Great Goku asked.
"Kakarot, have you got nothing better to do?" Vegeta snapped.
Seeing his reaction, Great Goku stopped asking and settled down to train.
Son Goku found the two of them and decided to teach them the training methods for Ultra Instinct and Ultra Ego. Whether they could master them would depend on their talent and luck.
"Ultra Instinct is an Angel Technique, while Ultra Ego is a God of Destruction Technique," Son Goku told them.
"Ultra Instinct lets your body fight on instinct without conscious thought. In other words, it amplifies your body's muscle memory, allowing it to attack and defend on its own.
"Ultra Ego activates every nerve in your body, putting you into a state of intense excitement and giving you an overwhelming sense that no one can rival you. You neither dodge nor evade enemy attacks, instead devoting all your strength to offense. It works even better when combined with destruction energy."
The two nodded.
"I'll demonstrate for you," Son Goku said.
He then activated Ultra Instinct and told them, "Transform into Super Saiyan 5 and attack me."
Great Goku and Vegeta did not hold back. With a loud roar, they transformed into Super Saiyan 5 and launched themselves at Son Goku.
Son Goku closed his eyes. With slight shifts of his body, he dodged each of their attacks.
They attacked for over ten minutes, yet could not even touch the hem of Son Goku's clothes.
Bam! Bam! Son Goku struck Great Goku and Vegeta with two Black Tiger Steals the Heart blows, knocking them back into their base forms.