Weak toFightingGroundFire ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	41.1
Lucario	FightingSteel	Force PalmAura SphereLegacy	34.9
Reshiram	DragonFire	Fire FangFusion FlareLegacy	34.1
Pheromosa	BugFighting	Low KickFocus Blast	31.9
Terrakion	RockFighting	Double KickSacred SwordLegacy	31.8
Blaziken	FireFighting	CounterAura Sphere	31.5
Chandelure	GhostFire	Fire SpinOverheat	31.2
Cinderace	Fire	Fire SpinPyroball	30.8
Volcarona	BugFire	Fire SpinOverheat	30.5
Darmanitan	Fire	Fire FangOverheat	30.4
Groudon	Ground	Mud ShotPrecipice BladesLegacy	29.3
Moltres	FireFlying	Fire SpinOverheat	29.1

Overcast boosts the Fighting attacks above. Snow boosts Perrserker.

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

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

Questions people ask

What is Perrserker weak to in Pokémon GO?

Perrserker takes 1.6 times from Fighting, Ground and Fire.

What's the best counter to Perrserker?

Blacephalon with Incinerate and Mind Blown, worth 41.1 damage per second against Perrserker's own defense. The full ranking is above.