Bronzong @ Light Clay
Ability: Heatproof
Tera Type: Steel
EVs: 252 HP / 4 Def / 252 SpD
Brave Nature
IVs: 0 Spe
- Rock Blast
- Reflect
- Light Screen
- Gyro Ball
Bronzong is a solid defensive pokemon, and always has been. Even in OU, where it's considered a mediocre option, any player that has faced one in the past knows how frustrating a Bronzong is to take down. That said, a traditional Bronzong is absolutely nothing in the face of any setup sweeper. Especially Volcarona. Gyro Ball is resisted, so even at +6 it'll do limited damage.
0+ Atk Bronzong Gyro Ball (150 BP) vs. 0 HP / 0 Def Volcarona: 114-135 (36.6 - 43.4%) -- guaranteed 3HKO
The only other move run on Bronzong that could even slightly threaten Volcarona is the resisted Body Press, which also will hardly harm it.
In return, Volcarona sets up Quiver Dances for free. The best thing Bronzong can do is Light Screen and then swap to an ally. Volcarona will have nullified the Light Screen, being at +2 Spa, and now outruns the enemy team and tanks special hits all day. Bronzong has set the team up for faliure. Any smart player would see the opportunity as a wincon and take it.
Which is where this very anti-meta Bronzong comes in. Lets start by addressing the choice of ability. Heatproof over Levitate. The confusion is exactly what we want. Bronzong's Levitate is the most iconic part about it. Knowing this, how often have you pressed a ground type move against Bronzong? The answer should be roughly never. We never assume that any Bronzong isn't running levitate. So lets use that to our advantage. Heatproof will guarantee that Bronzong comfortably lives a Flamethrower from Volcarona. Meanwhile it won't need Levitate because no one will use ground moves on it anyway.
252 SpA Volcarona Flamethrower vs. 252 HP / 252 SpD Heatproof Bronzong: 110-132 (32.5 - 39%) -- 98.6% chance to 3HKO
Even at +2 and no Light Screen, Bronzong lives.
In return, a 3-hit Rock Blast will OHKO.
0+ Atk Bronzong Rock Blast (3 hits) vs. 0 HP / 0 Def Volcarona: 312-372 (100.3 - 119.6%) -- guaranteed OHKO
I'm now going to go through the possible scenarios to highlight how often this will work.
Scenario A:
The enemy brings in Volcarona on Bronzong as it probably uses Light Screen. Expecting it to swap, they press Quiver Dance. Rock Blast OHKOs. Bronzong wins.
Scenario B:
Identical to scenario A, except Volcarona presses Flamethrower, doing less than half to Bronzong, and dying in return.
Scenario C:
Volcarona presses Quiver Dance as Bronzong uses Rock Blast. Bronzong gets only 2 hits, leaving Volcarona with a maximum of 33.2% health.
0+ Atk Bronzong Rock Blast (2 hits) vs. 0 HP / 0 Def Volcarona: 208-248 (66.8 - 79.7%) -- approx. 2HKO
Most Volcarona will respond by pressing Flamethrower, expecting to kill and falling short, before dying to the second rock blast.
+1 252 SpA Volcarona Flamethrower vs. 252 HP / 252 SpD Heatproof Bronzong: 164-194 (48.5 - 57.3%) -- 93.4% chance to 2HKO
Alternatively, a safe player may (Quite unreasonably if you ask me) Tera Ground in order to guarantee they survive a rock blast (As if they wouldn't normally kill). Because of this, and the fact that Volcarona is at +1 speed, the right move is Gyro Ball, which kills even if they don't Tera and doesn't risk a miss.
0+ Atk Bronzong Gyro Ball (136 BP) vs. 0 HP / 0 Def Volcarona: 103-122 (33.1 - 39.2%) -- 100% chance to 3HKO (Okay admittedly if you get two min rolls in a row this won't kill but still)
Scenario D:
This scenario only comes into play if the Volcarona knows you are a Heatproof Bronzong. They immediately Tera Ground and Tera Blast.
252 SpA Tera Ground Volcarona Tera Blast vs. 252 HP / 252 SpD Bronzong: 192-228 (56.8 - 67.4%) -- guaranteed 2HKO
0+ Atk Bronzong Rock Blast (3 hits) vs. 0 HP / 0 Def Tera Ground Volcarona: 39-45 (12.5 - 14.4%) -- approx. possible 7HKO
0+ Atk Bronzong Gyro Ball (136 BP) vs. 0 HP / 0 Def Tera Ground Volcarona: 207-244 (66.5 - 78.4%) -- guaranteed 2HKO
This is why, to be safe, you want a Light Screen up as the Volcarona swaps in. That way you can still beat it in 3 turns.
252 SpA Tera Ground Volcarona Tera Blast vs. 252 HP / 252 SpD Bronzong through Light Screen: 96-114 (28.4 - 33.7%) -- 0.2% chance to 3HKO
However, I believe this is an unrealistic scenario, for the enemy to know the purpose of the gimmick immediately. Considering we still mostly win, I'd call this a 4th success.
TLDR:
Rock Blast kills and we tank any hit