Goku's multiverse-level combat power can overcome even the Phoenix's resurrection cycle through sheer overwhelming force.
The mythological Phoenix is one of the most resilient creatures in all of legend โ an immortal firebird that dies in a blaze of flame only to be reborn from its own ashes. It represents the cycle of death and rebirth, and in most mythological traditions, it cannot be permanently destroyed. Its flames are purifying and supernatural, capable of burning anything they touch.
Goku in Ultra Instinct form operates at a power tier that dwarfs most mythological entities. His ki output is universal-level โ he nearly destroyed Universe 7 during his clash with Beerus, and he's only gotten exponentially stronger since then. His speed transcends time, his durability allows him to tank attacks that could destroy planets, and Ultra Instinct lets his body react to threats autonomously.
The Phoenix's immortality through rebirth is its defining trait and its greatest advantage. Even if Goku destroys the Phoenix completely, it should theoretically rise again from its ashes. But Goku has faced regenerating opponents before โ Cell could regenerate from a single cell โ and Goku's response was simply to output enough energy to destroy every cell simultaneously.
The question is whether Goku's ki can prevent the Phoenix's supernatural rebirth. Given that Goku has fought beings who manipulate time, space, and reality itself, and that his ki has been shown to disrupt supernatural effects through sheer force, it's plausible that a sufficiently powerful Kamehameha could overwhelm even the Phoenix's regeneration cycle.
The Phoenix is mythologically immortal โ it always returns from death through its cycle of rebirth. Its flames are supernatural and purifying, capable of harming beings regardless of physical durability. If its rebirth cannot be prevented by any amount of force, the Phoenix is functionally invincible and will eventually outlast even Goku through infinite attrition.
Goku's power output at Ultra Instinct levels is universal-to-multiversal, far exceeding anything in classical mythology. He has dealt with regenerating opponents by simply overwhelming their healing with raw energy. His speed and combat ability mean the Phoenix can never harm him, while he can destroy it repeatedly. If his ki can disrupt the supernatural rebirth, one sufficiently powerful attack ends this.
Goku wins the fight in every practical sense โ the Phoenix cannot harm him, and he can destroy it as many times as it reforms. Whether the Phoenix's mythological immortality can be permanently overcome is debatable, but in terms of combat, Goku dominates every exchange. The Phoenix's rebirth makes it impossible to 'lose,' but it also can never win against a multiverse-level fighter.
Phoenix also fights
Goku also fights