Weak toGroundGhostFireDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	31.9
Reshiram	DragonFire	Fire FangFusion FlareLegacy	26.5
Chandelure	GhostFire	Fire SpinOverheat	24.3
Cinderace	Fire	Fire SpinPyroball	23.9
Volcarona	BugFire	Fire SpinOverheat	23.7
Darmanitan	Fire	Fire FangOverheat	23.6
Darkrai	Dark	SnarlShadow Ball	23.2
Gengar	GhostPoison	LickShadow BallLegacy	23.0
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	22.8
Groudon	Ground	Mud ShotPrecipice BladesLegacy	22.8
Moltres	FireFlying	Fire SpinOverheat	22.6
Absol	Dark	SnarlBrutal SwingLegacy	22.5

Clear boosts the Fire attacks above. Snow and Windy boost Bronzong.

Level 40, 15 attack IV, costed against Bronzong's own defense and typing, one per evolution family.

Bronzong's moveset, CP and shiny All counters Raid board

Questions people ask

What is Bronzong weak to in Pokémon GO?

Bronzong takes 1.6 times from Ground, Ghost, Fire and Dark.

What's the best counter to Bronzong?

Blacephalon with Incinerate and Mind Blown, worth 31.9 damage per second against Bronzong's own defense. The full ranking is above.