While it is not known to evolve into or from any other Pokémon, it can undergo Primal Reversion and become Primal Kyogre if it holds the Blue Orb.
Kyogre possesses the ability to expand the oceans. In ancient times, it came into conflict with Groudon, a Pokémon with the ability to expand continents. In Pokémon Sapphire, Emerald, and Alpha Sapphire, Kyogre is sought after by Team Aqua as part of their plot to create more habitats for aquatic Pokémon by raising the sea level.
Kyogre is the game mascot of Pokémon Sapphire and its remake, Pokémon Alpha Sapphire, appearing on the boxart of both.
Along with Groudon and Rayquaza, Kyogre is a part of the weather trio.
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Kyogre is a massive whale-like Pokémon with two big pectoral fins, each with four white square-shaped nails. It has a deep blue body and a white chin area with two small spikes protruding under it. Above each eye are two white, oval-shaped spots. It has red stripes around its chin, eyes, dorsal fins, and torso. These stripes glow when Kyogre is brimming with power. The tail is tattered with four trailing parts, the inner ones being smaller than the outer. Its eyes are small, yellow, and shadowed with black.
Primal Kyogre is similar to Kyogre, but it grows to more than twice its usual size. Its skin color changes to a darker shade of blue. The four trailing parts of its tail are considerably longer and flat at the ends, and each have half-translucent webbing down the middle. Its forehead now has the α symbol, which is connected to the two large oval-shaped spots and tail, and light blue α symbols are seen on each pectoral fin, connecting to the outer nails with a red marking connecting to the inner nails. The red stripes adorning its body become light blue. There are two yellow shaped symbols inside the oval-shaped spots. The white parts of Kyogre's body, as well as the areas between the markings on the pectoral fins, become half-translucent. A mysterious golden light glows from within Primal Kyogre's body. In the anime, Primal Kyogre is said to has created and widened the seas by a large margin simply by taking a swim.
Kyogre is said to be a powerful Pokémon, having control over the element of water and rain to have quenched areas of the world plagued with drought and to have expanded the seas. Kyogre is normally calm and peaceful, but if it meets its rival, Groudon, Kyogre will engage in a cataclysmic battle against it. In the Mystery Dungeon series and core series, Kyogre is able to fly. Kyogre generally lives deep in the ocean, and is said to rest in a deep trench. Kyogre is the only known Pokémon capable of learning the move Origin Pulse.