You could make a real nice use of will-o-wisp to weaken his pokemon. Just remember not to burn Conkeldurr, and most of the time you'll want to being using Psychic to hit that special side.
Here's the game plan. Assuming his Mienshao isn't scarfed, Swoobat should be able to make quick work of it with air slash. A lot of his team should lose to air slash+heart stamp, assuming you get flinches lol, plus Swoobat should be faster than everything iirc bar maybe Hawlucha. Delphox, Swoobat and Emolga I would assume are the star players here. I reccomend leading with Swoobat also, to start with some momentum. I Hope we helped!