Well, there are a lot of Pokemon to choose from, but I'm only going to do these 2 guys:
You hate those pesky burns on Dragonite when you set up a Dragon Dance, but you have Heal Bell on your Audino for that. Plus Audino's Dazzling Gleam helps take out Sableye that burns and burns and recovers and burns. And, Dragonite can use ESpeed on them pesky Talonflames and them Brave Birds.
And here's the other guy:
Whimsicott is very useful in Doubles. It can Taunt Sableye, which is really good and has Switcheroo so he can really mess up your opponents strategy. Whimsicott also has access to Knock Off and Leech Seed, which provides opponents rage quitting and good healing.
Hope I helped!