Weak toFlyingRockFire ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	59.2
Reshiram	DragonFire	Fire FangFusion FlareLegacy	49.1
Salamence	DragonFlying	Fire FangFly	45.3
Chandelure	GhostFire	Fire SpinOverheat	45.0
Moltres	FireFlying	Fire SpinFly	44.6
Cinderace	Fire	Fire SpinPyroball	44.4
Enamorus	FairyFlying	Fairy WindFly	44.1
Volcarona	BugFire	Fire SpinOverheat	43.9
Darmanitan	Fire	Fire FangOverheat	43.7
Yveltal	DarkFlying	GustOblivion WingLegacy	43.6
Toucannon	NormalFlying	PeckBeak BlastLegacy	43.2
Glimmora	RockPoison	Rock ThrowMeteor Beam	42.5

Clear boosts the Fire attacks above. Rainy boosts Rellor.

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

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

Questions people ask

What is Rellor weak to in Pokémon GO?

Rellor takes 1.6 times from Flying, Rock and Fire.

What's the best counter to Rellor?

Blacephalon with Incinerate and Mind Blown, worth 59.2 damage per second against Rellor's own defense. The full ranking is above.