Whis points out that since Goku has no allies to help him and no time to recover from the strain caused by Ultra Instinct, this will be his last chance to end the battle. Goku and Jiren resume their battle, but Goku has the same problem he experienced with Kefla, and is unable to attack at his full potential. Goku tries the same trick he used on Kefla, by powering up a Kamehameha while dodging and firing it at Jiren, but Jiren is able block the attack and fire his own blast right through to Goku. Belmod is confident that Goku's incomplete Ultra Instinct will not be enough to win, but Vegeta points out that, throughout the tournament, all of the Saiyans have been able to surpass their limits and achieve higher levels of power. Worried, Belmod shouts at Jiren to finish off Goku immediately. Jiren is able to trap Goku on a single floating rock and fires a barrage of attacks down at him, in an attempt to knock him out, but Goku begins blocking Jiren's attacks with his own punches, and he even lands a solid blow on Jiren. Goku then unleashes all of his power, which manifests as a galaxy-like nebula encompassing the entire area below the fighting stage. Jiren then gathers all of his power and launches a final blast down at Goku, but Goku suddenly transforms again and powers up immensely. He easily nullifies Jiren's blast and jumps back up to the fighting stage. Jiren attacks again, but this time, Goku easily overpowers him with a flurry of punches. Whis reveals that Goku has completed his ascension. Goku's hair and eyes have turned silver, and he now has full mastery over Ultra Instinct. Source:Wikipedia

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