Weak toGroundFire ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	30.3
Reshiram	DragonFire	Fire FangFusion FlareLegacy	25.2
Chandelure	GhostFire	Fire SpinOverheat	23.1
Cinderace	Fire	Fire SpinPyroball	22.7
Volcarona	BugFire	Fire SpinOverheat	22.5
Darmanitan	Fire	Fire FangOverheat	22.4
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	21.6
Groudon	Ground	Mud ShotPrecipice BladesLegacy	21.6
Moltres	FireFlying	Fire SpinOverheat	21.4
Volcanion	FireWater	IncinerateOverheat	21.2
Heatran	FireSteel	Fire SpinMagma StormLegacy	21.2
Flareon	Fire	Fire SpinOverheat	21.0

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

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

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

Questions people ask

What is Magearna weak to in Pokémon GO?

Magearna takes 1.6 times from Ground and Fire.

What's the best counter to Magearna?

Blacephalon with Incinerate and Mind Blown, worth 30.3 damage per second against Magearna's own defense. The full ranking is above.