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Fuck.
Kyogre
It'd probably have to be smaller on some way since a giant water whale already sounds broken as fuck.
Up B: Kyogre flaps his wings upwards releasing a torrent of water underneath itself.
Left/Right B: It surrounds itself with water and does a quick headsmash at opponents.
Down B: Water Spout. Water erupts from it's...spout damaging enemies overhead. Stronger the less damage it's taken.
B: Covers itself with a water shield that can deflect projectiles. If you hold it long enough the water shield explodes causing damage to anyone near it.
Final Smash: A flood envelops everyone in water and Kyogre swims around eating everyone. Increased speed also because why not.