Something I've been playing around with a little bit has been bronzong, and I think it's pretty interesting.
I figured it would be unimpressive unless you were running a really obscure bulky trick room or something, so I didn't pay it much attention until I realized how much of the really prevalent pokemon in the metagame it hard walls. I built the team in just a little bit, it's much more offensive minded and I think bronzong would fit better on something like a balance, but still I liked the results.
Scarf Chomp (252 Atk Garchomp Outrage vs. 252 HP / 252+ Def Bronzong: 63-75 (18.6 - 22.1%) -- possible 6HKO after Stealth Rock and Leftovers recovery)
Lando-T (252+ Atk Landorus-Therian Stone Edge vs. 252 HP / 252+ Def Bronzong: 42-50 (12.4 - 14.7%) -- possibly the worst move ever)
Magearna (252+ SpA Choice Specs Magearna Fleur Cannon vs. 252 HP / 4 SpD Bronzong: 153-180 (45.2 - 53.2%) -- 35.5% chance to 2HKO after Stealth Rock and Leftovers recovery)
Mega Metagross (252 Atk Tough Claws Metagross-Mega Thunder Punch vs. 252 HP / 252+ Def Bronzong: 75-89 (22.1 - 26.3%) -- possible 5HKO after Stealth Rock and Leftovers recovery)
Mega Pinsir (252 Atk Pinsir-Mega Close Combat vs. 252 HP / 252+ Def Bronzong: 97-115 (28.6 - 34%) -- guaranteed 4HKO after Stealth Rock and Leftovers recovery)
Salamence (+1 252 Atk Salamence Supersonic Skystrike (175 BP) vs. 252 HP / 252+ Def Bronzong: 143-168 (42.3 - 49.7%) -- guaranteed 3HKO after Stealth Rock and Leftovers recovery)
Tapu Bulu (252 Atk Tapu Bulu All-Out Pummeling (190 BP) vs. 252 HP / 252+ Def Bronzong: 135-159 (39.9 - 47%) -- guaranteed 3HKO after Stealth Rock and Leftovers recovery)
Here's two quick replays on my alt. I think I'm only like 1500-ish on this one, but the battles show how bronzong can actually, like, do something.
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http://replay.pokemonshowdown.com/gen7ou-559778539
In this replay, it didn't do a whole lot but it handled tapu koko, ferrothorn, starmie and landorus well. My opponent ends up forfeiting towards the end and we win. It did its job in keeping landorus in check, keeping rocks on the field, and switching into attacks when I needed something to go into.
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http://replay.pokemonshowdown.com/gen7ou-559787887
Here it chips down mawile enough to where hoopa can take it out, and gets up rocks. Really that's all it'll do most games - stop an enemy's threat (Whether that be mawile, metagross, pinsir, dd mence, etc.) for a little while, get up rocks, and die.
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http://replay.pokemonshowdown.com/gen7ou-559795672 I lost this one but that's only because I played poorly. Bronzong put a stop to medicham before it tore apart my team, and that was enough for me.
I won't oversell its utility, it is far from perfect. Rocks are nice, but it really only does ok because the meta is in a place where there are so many offensive behemoths it's hard to beat all of them in one slot. Bronzong sure doesn't do this, but it handles quite a few of them. In terms of soft checks, it can be a nuisance to koko, lele, magearna, mega mawile and mega medicham. Not perfect, but a cool mon worth checking out. Idk, anyone else's thoughts?
http://replay.pokemonshowdown.com/gen7ou-559778539