Weak toRockElectricIce ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	72.6
Zeraora	Electric	Volt SwitchPlasma Fists	62.3
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	60.9
Xurkitree	Electric	Thunder ShockDischarge	60.2
Glimmora	RockPoison	Rock ThrowMeteor Beam	55.0
Rampardos	Rock	Smack DownRock Slide	54.5
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	52.7
Deoxys	Psychic	Charge BeamThunderbolt	52.4
Gigalith	Rock	Lock OnMeteor BeamLegacy	52.3
Electivire	Electric	Thunder ShockWild Charge	52.1
Tyrantrum	RockDragon	Rock ThrowMeteor Beam	51.0
Raikou	Electric	Volt SwitchWild Charge	50.7

Rainy boosts the Electric attacks above. Partly cloudy and Windy boost Fletchling.

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

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

Questions people ask

What is Fletchling weak to in Pokémon GO?

Fletchling takes 1.6 times from Rock, Electric and Ice.

What's the best counter to Fletchling?

Regieleki with Lock On and Thunder Cage, worth 72.6 damage per second against Fletchling's own defense. The full ranking is above.