Weak toGroundFire ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	37.5
Reshiram	DragonFire	Fire FangFusion FlareLegacy	31.1
Chandelure	GhostFire	Fire SpinOverheat	28.5
Cinderace	Fire	Fire SpinPyroball	28.1
Volcarona	BugFire	Fire SpinOverheat	27.8
Darmanitan	Fire	Fire FangOverheat	27.7
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	26.8
Groudon	Ground	Mud ShotPrecipice BladesLegacy	26.8
Moltres	FireFlying	Fire SpinOverheat	26.5
Volcanion	FireWater	IncinerateOverheat	26.3
Heatran	FireSteel	Fire SpinMagma StormLegacy	26.2
Flareon	Fire	Fire SpinOverheat	26.0

Clear boosts the Fire attacks above. Overcast and Snow boost Klefki.

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

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

Questions people ask

What is Klefki weak to in Pokémon GO?

Klefki takes 1.6 times from Ground and Fire.

What's the best counter to Klefki?

Blacephalon with Incinerate and Mind Blown, worth 37.5 damage per second against Klefki's own defense. The full ranking is above.