It seems to resemble something like a big dark blue whale or orca. It has two big fins or "wings", each ending with four square-shaped "claws." It has a deep blue body and a white chin area with two spikes protruding under it. Above each eye are two spots. It has markings on its wings which sort of resemble the letter A with a circle on the top. It also has two small dorsal fins on its back with two stripes running horizontally below the fins. The tail seems tattered with four trails, the inner smaller than the outer. It also has a mouth full of rarely seen sharp triangular teeth.
Kyogre does not evolve. However, in Omega Ruby and Alpha Sapphire, it is capable of changing into its Primal Form.
Before Generation 5, Kyogre was the only Pokémon to have the Drizzle ability.
Most of the legendary trio's and duo's look somewhat alike or at least have the same body class. However, all members of the Weather trio are completely different to one another. Kyogre is based on a killer whale, Groudon is based on a theropod dinosaur, whilst Rayquaza is based on a Chinese dragon.
Kyogre's moveset has an advantage over all other members of its trio. Water attacks on Groudon and Ice attacks on Rayquaza are super-effective.
It is highly likely that Kyogre is based on the Leviathan from Judeo-Christian religion.
Kyogre's name originates from Kai, which means ocean. Kyogre's name ends in ogre, due to it being large. Without the "Ogre" part, it spells out Kaiō, which means King of the Sea. Also, Kaiō is the first four letters of the word Kaiōsei which means Neptune, the Roman version of the Greek god of the sea, Poseidon.
Kyogre as it appears on the cover of Pokemon Alpha Sapphire