So far I've only had fights in the Master and Ultra Leagues. Master I've used Mewtwo, Rayquaza, and the 3rd has been shuffled between Kyogre and Metagross. Not creative but hey, it was fun getting a feel for how PvP works with them.
Ultra League I got creative with my team. Giratina, Deoxys, and Metagross and Typhlosion being swapped around the last slot. Lots of fun, I really enjoyed getting some use out of Giratina. Psycho Boost hits pretty damn hard but I don't recall being able to use it more than once.