Weak toFightingGroundFire ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	29.0
Lucario	FightingSteel	Force PalmAura SphereLegacy	24.6
Reshiram	DragonFire	Fire FangFusion FlareLegacy	24.1
Pheromosa	BugFighting	Low KickFocus Blast	22.5
Terrakion	RockFighting	Double KickSacred SwordLegacy	22.4
Blaziken	FireFighting	CounterAura Sphere	22.2
Chandelure	GhostFire	Fire SpinOverheat	22.0
Cinderace	Fire	Fire SpinPyroball	21.7
Volcarona	BugFire	Fire SpinOverheat	21.5
Darmanitan	Fire	Fire FangOverheat	21.4
Groudon	Ground	Mud ShotPrecipice BladesLegacy	20.7
Moltres	FireFlying	Fire SpinOverheat	20.5

Overcast boosts the Fighting attacks above. Overcast and Snow boost Zamazenta.

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

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

Questions people ask

What is Zamazenta weak to in Pokémon GO?

Zamazenta takes 1.6 times from Fighting, Ground and Fire.

What's the best counter to Zamazenta?

Blacephalon with Incinerate and Mind Blown, worth 29.0 damage per second against Zamazenta's own defense. The full ranking is above.