Actually, despite the name, the orca is not a whale. It's a dolphin.Besides Kyogre you mean?I want to see an Orca pokemon, probably water-fighting or water-dark. After all, the Orca is the most predatory creature on earth! It could have very high attack, and maybe an ability like Defeatist to make up for its massive attack.
But yeah, a non-legendary Orca whale would be cool. It would have to stand out in appearance from Kyogre though, lest we get another Alomomola incident.
I never especially liked Kyogre. And besides, Kyogre was a whale, not an Orca. Orcas eat whales for breakfast! (literally.)
Orca = Killer Whale.