BO/Semi-Stall team that I've recently had success with. Made it to the low 1700s and I am not a very good player.
Importable:
https://pokepast.es/7fa747e24a87c312
The basic premise of this team is to get hazards up, knock off items (especially HDB), and maintain pressure via the two set-up sweepers.
Bulky volcarona can come in multiple times a game and immediately threaten mons like corviknight to keep hazards on the field. I click flamethrower more often than QD early game.
I have two knock off users in Pex and Clef - opposing heatran can quickly be worn down after its leftovers are removed.
Tank Chomp is for removing or severely damaging Urshifu RS and other mons due to passive chip. The 4th slot can either be rest or endure. If rest is run, I like aromatherapy on clefable.
Reuni is completely walled by dark types, but if you can force them to come in on spikes/rocks/T-spikes they can be quickly worn down and removed. The EVs are spread so it can set up on non-specs Koko
Clef is unaware simply because this team is so slow and sometimes being set-up on is unavoidable.
Skarmory is a Rilla check as it can match its SDs with Iron Defense. Also a solid spike setter and can get additional chip w/ rocky helmet.
Threats: Fast taunt users (Tapu Fini, Heatran, Tornadus-T, etc.); Specs Tapu Lele; Kartana if boosted; Volcarona if garchomp is dead.