Hey! Solid team you have here, although there's still room for improvement.
You should really change your Bronzong set. While Bronzong is quite a good pokemon in OU if used right, using a CM set with mono-Steel coverage is absolutely terrible. OU is infested by Steel types, that can freely switch on you and troll you as they please. Ferrothorn can come in, Leech Seed, and set up four layers of hazards as you try to hurt it somewhat. Heatran can just roast you with its Fire coverage until it gets a burn, or a critical hit, and since +6 uninvested Flash Cannon is not even guaranteed to 4HKO, you're not doing something in return anytime soon - especially if Heatran carries Roar. Forretress can freely spin, and while not usually happy to set up on a special attacker, it takes basically nothing anyway from Flash Cannon (need Bronzong to reach +6 to be 2HKO'd). Jirachi, while not capable to harm Bronzong, can just stall out your Flash Cannons while it Wishes, Calm Minds too, or whatever. I suggest changing your set to a more standard Support Bronzong, that does the job of setting up Rocks equally well, and is somewhat threatening for its switch-ins, at least. It would actually give you some Ice coverage, thus being a secondary check to DD Dragonite which is very scary if Mamoswine has been removed or weakened enough for Extremespeed to get the KO; also, it lets you hit Gliscors and Landoruses that could othwerise be a nuisance.
Bronzong @ Leftovers | Levitate
Sassy | 252 HP / 84 Atk / 80 Def / 92 SpD | 2 Spe IVs
- Stealth Rock
- Gyro Ball
- Hidden Power Ice
Also, I would change a bit your Gliscor set. EVs are questionable, since I don't really see a purpose in lowering defenses to put 100 EVs in attack. However, the moveset is really not great; SD Gliscor appreciates much more Protect over Substitute, since it can scout with it and get free Toxic Heal turns while getting a great advantage on Choiced opponents. Also, I would really suggest changing Facade into Ice Fang. While it may seem underwhelming, you have absolutely no way to hit Gengar at the moment, and Gengar looks quite threatening for the rest of your team (My Bronzong set partially fixes that, but your set could eat a Disable on Flash Cannon and become useless...). Ice Fang gives you at least a way to take down its Sub, and switch out predicting the Disable. Also it's nice to have coverage on Dragons and Breloom. This is my suggested set:
Gliscor @ Toxic Orb | Poison Heal
Impish | 252 HP / 184 Def / 72 Spe
- Swords Dance
- Ice Fang
Hope it helped! Good luck for your team.