Yeah, I'm already considering how to fit Azumarill in OU. The problem is that it is still viable to get picked off by Dragonite E-Speed unless you run Chilan berry (lol). Also Aqua Jet can't kill anything really bulky and/or resists water (like Celebi and Suicune and stuff), and it gets outspeed by almost anything. You can run subsalac to remedy that (it now outspeeds Luke at least, though Draggy still resists Aqua Jet), but it still doesn't get enough speed against some things that resist water. You'll need plenty of support to ensure a drumjet Azu sweep.