Had a pair of 3-on-3 casual battles with a guy at the local game shop. We both won one apiece.
First battle, it was my Hawlucha, Talonflame, and Delphox against his (mega) Garchomp, Charizard, and Lucario. I wore down his Mega Garchomp, Talonflame beat Charizard in a Fly vs. Fly duel, and Delphox outright smelted Lucario. The only casualty here was Hawlucha.
Second battle was my Mienshao, Delphox, and Mega Absol against his Ampharos, Charizard, and Mega Tyranitar. Ampharos hits hard on the Sp.Atk, but Delphox could've taken him if she hadn't GOTTEN PARALYZED AND THEN LOSE TWO TURNS IN A ROW. Mega Absol hit hard enough to convince him to switch to Mega Tyranitar (oops, should have stuck with Night Slash than Psycho Cut). Did get off a Perish Song before going down. In return, Mienshao outright ONE-SHOTS Tyranitar's 4x weakness to Fighting, though Charizard comes in to finish it off with Fly.