Shin Godzilla's form lay motionless in the rubble, but beneath the charred exterior, a sinister transformation was taking place. His eyes flickered back to life, glowing a menacing purple that radiated pure, unfiltered rage. It wasn't just anger directed at the other Godzilla; it was a deep-seated fury at himself for allowing such a defeat.

In a few minutes, the regenerative process was complete. Shin Godzilla's wounds closed, his spines regained their eerie glow, and his strength returned. Rising from the debris, he surveyed the devastation around him. The other Godzilla was gone, having returned to the ocean, believing the threat to be neutralized.

Shin Godzilla let out a guttural growl, a sound that resonated with frustration and determination. He was infuriated by his own limitations, by the fact that he had allowed himself to be overwhelmed. The memory of the searing atomic breath that had nearly driven him into unconsciousness fueled his rage. He should have retaliated, should have used his own devastating power to keep the other Godzilla at bay. But he hadn't, and now he was left with the bitter taste of defeat.

The realization that he had to evolve further, to become stronger, more resilient, and more destructive, was clear. He would not be caught off guard again. He needed to mutate, to push his abilities beyond their current limits. Only then would he stand a chance in their next encounter.

With a final glance at the ruined city, Shin Godzilla turned and began his march back to the ocean. His massive form waded into the water, and he disappeared beneath the waves, swimming away into the depths. The ocean would be his crucible, a place where he could undergo the necessary transformations to prepare for the inevitable rematch.

As he swam deeper and deeper, his mind was already racing with thoughts of mutation and adaptation. He would harness the power of his rage, channeling it into his evolution. The next time he faced the Legendary Godzilla, he would be ready. He would be stronger, more formidable, and utterly relentless.

The world above remained blissfully unaware of the dark force gathering strength beneath the ocean's surface. But for Godzilla, the King of the Monsters, a new and more terrifying battle was on the horizon, one that would test his might and resolve like never before.