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Magikarp started the battle by unleashing the devastating ability "Hydro Pump Blast of Unlimited Fathomless Waters," causing massive tidal waves to crash down on Arceus. Arceus retaliated with the ability "Judgment Day's Apocalyptic Annihilation," creating a beam of light that obliterated everything in its path.
Magikarp, not one to be outdone, used its ability "Infinite Gills of Aquatic Regeneration" to heal itself instantly and unleash an all-out assault with the ability "Tsunami Slap of the Seven Seas," striking Arceus with a flurry of water-based attacks.
Arceus responded with "Divine Retribution of the Cosmic Realm," summoning lightning bolts from the heavens that struck Magikarp with the full force of the universe. However, Magikarp's ability "Transcendent Evolution of Supreme Power" allowed it to evolve into its ultimate form: Gyarados.
Gyarados used the ability "Raging Tempest of Unbridled Fury," creating a massive storm that battered Arceus relentlessly. Arceus attempted to use its final move, "Omniscient Judgment of Absolute Control," which would have granted it complete control over all reality.
However, Gyarados's "Apex Predator's Wrathful Fury" proved too much for Arceus to handle, as it charged forth and landed the final strike with a "Thunderous Collision of Inevitable Destruction."