Kyogre

Although Kyogre remains a strong threat in ORAS, the former king of Ubers has fallen very far from its throne. Previously extremely difficult to halt due to its immensely powerful, Drizzle-fueled Water-type attacks, Kyogre's longtime rival Groudon gained a new Primal Reversion that sports heavy sunlight irreversible by Drizzle and immunity to Water- and Electric-type attacks, heavily neutering Kyogre's offense and making it far easier to check. The reintroduction of Soul Dew and the transition to a more physical-attack based metagame in ORAS leave Kyogre a little high and dry in the tier. Although it gained a Primal Reversion of its own, Primal Kyogre still struggles to tango with its ubiquitous counterpart Primal Groudon and its immensely powerful Precipice Blades, as the whale does not have a way to fight back as easily without the weather on its side.

That being said, one would be foolish to underestimate Kyogre. Its Primal Reversion is still extremely formidable, boasting STAB Water-type attacks backed by Primordial Sea and a titanic base 180 Special Attack. Further supplemented by Calm Mind and solid 100 / 160 special bulk, Primal Kyogre is a formidable wallbreaker and check to key special attackers, both roles that give it a clear niche in the metagame. Though the whale is easier to check in ORAS, it is still an enormous threat, one that Primal Groudon alone may not be enough to stop.