dont forget, bronzong has eathquake to OHKO excadrill.
and lackluster? hardly. if its enough to ohko gliscor, its good enough.
Let's do some calcs:
Bronzong Trait: Levitate
EVs: 252 Atk
Brave Nature (+Atk, -Spd)
Earthquake on Excadrill (without Def and HP)
280 - 330 = 77.6% - 91.4%
LO-Earthquake on Excadrill
362 - 428 = 100.3% - 118.6%
Well, we definitely need spikes or Life Orb on Bronzong.
Bronzong
Trait: Levitate
EVs: 252 SAtk
Quiet Nature (+SAtk, -Spd)
HP Fighting on Excadrill (still no Def or HP investment)
122 - 144 = 33.8% - 39.9%
LO-HP Fighting on Excadrill
158 - 186 = 43.8% - 51.5%
Besides it's no surprise Bronzong can OHKO Gliscor with HP Ice. With a quadruple weakness it almost die from any special ice move.
It IS possible to OHKO Excadrill at minimum with LO-Pure-Offensive-Bronzong.
On the other side I often see this kind of Excadrill:
Excadrill (M) @ Leftovers Trait: Sand Rush
EVs: 160 HP / 232 Atk / 116 Spd
Jolly Nature (+Spd, -SAtk)
KO, maybe no OHKO, but what about survival?
+2 X-Scissors on Bronzong (max. HP, no Def)
232 - 274 = 68.6% - 81.1%
Excadrill isn't at full power but after swords dance it still 2HKO Bronzong.
But Bronzong wasn't at its best defens either:
+2 X-Scissors on Bronzong (max HP , max Def, Impish nature)
172 - 202 = 50.9% - 59.8%
Ouch, it still hurt like hell.That's a clean 2HKO on Bronzong without leftovers and a close one if we consider leftovers.
K, Bronzong may not be a counter, but it's still a solid check. Oh, boy it takes much to take it down.