Weak toGrassElectric ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	43.1
Zeraora	Electric	Volt SwitchPlasma Fists	37.0
Kartana	GrassSteel	Razor LeafLeaf Blade	36.9
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	36.2
Xurkitree	Electric	Thunder ShockDischarge	35.7
Roserade	GrassPoison	Magical LeafLeaf Storm	31.4
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	31.3
Deoxys	Psychic	Charge BeamThunderbolt	31.1
Electivire	Electric	Thunder ShockWild Charge	30.9
Zarude	DarkGrass	Vine WhipPower Whip	30.8
Rillaboom	Grass	Razor LeafFrenzy PlantLegacy	30.5
Raikou	Electric	Volt SwitchWild Charge	30.1

Rainy boosts the Electric attacks above. Rainy boosts Brionne.

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

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

Questions people ask

What is Brionne weak to in Pokémon GO?

Brionne takes 1.6 times from Grass and Electric.

What's the best counter to Brionne?

Regieleki with Lock On and Thunder Cage, worth 43.1 damage per second against Brionne's own defense. The full ranking is above.