With a Choice Band and an EV spread that allows Protosynthesis to boost its Speed when Sun is up, Gouging Fire becomes a scary wallbreaker in Sun. Add to this Tera Fire and the high base power moves in Flare Blitz and Raging Fury. Hatterene's Magic Bounce allows the field to stay clear of hazards, with Tera Water helping against Volcarona and opposing Walking Wake, being able to Nuzzle them. Jolly Kingambit outspeeds most Skarmory and Corviknight, and with Tera Dark and Black Glasses it is able to break pass bulkier teams. More details in Chicos's RMT.
Description by leng loi: Mirror Herb Zamazenta is a very cool set that lets you revenge setup Pokemon like Dragon Dance Roaring Moon and break through Iron Defense Skarmory with some chip. Non-Leftovers Zamazenta always makes me want to run Grassy Terrain, so I started with Assault Vest Rillaboom (to act as a Dragapult and Gholdengo switch-in) and two Grassy Seed abusers. The Gholdengo spread deals with Dragapult and the Gouging Fire outspeeds Weavile at +1 while maximizing bulk. With Breaking Swipe, it can PP stall Dondozo depending on the set. Finally, Landorus-T and Focus Sash Dragapult round out the team with important immunities, utility, and speed control.
With its good physical bulk and access to Magic Guard, Reuniclus can stand up to physical attackers like Great Tusk and Iron Boulder, while also dealing with bulkier Pokemon like Garganacl and Dondozo. Shadow Ball lets Reuniclus hit Gholdengo, while Focus Blast is another option to hit Dark-types like Kingambit. Assault Vest Tornadus-T can deal with the likes of Iron Valiant, Enamorus, and Dragapult