Weak toPoisonGrassElectric ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	25.6
Zeraora	Electric	Volt SwitchPlasma Fists	22.0
Kartana	GrassSteel	Razor LeafLeaf Blade	21.9
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	21.5
Xurkitree	Electric	Thunder ShockDischarge	21.3
Eternatus	PoisonDragon	Poison JabSludge Bomb	20.4
Naganadel	PoisonDragon	Poison JabSludge Bomb	19.4
Roserade	GrassPoison	Magical LeafLeaf Storm	18.7
Deoxys	Psychic	Charge BeamThunderbolt	18.5
Electivire	Electric	Thunder ShockWild Charge	18.4
Nihilego	RockPoison	Poison JabSludge Bomb	18.4
Zarude	DarkGrass	Vine WhipPower Whip	18.3

Rainy boosts the Electric attacks above. Overcast and Rainy boost Tapu Fini.

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

Tapu Fini's moveset, CP and shiny All counters Raid board

Questions people ask

What is Tapu Fini weak to in Pokémon GO?

Tapu Fini takes 1.6 times from Poison, Grass and Electric.

What's the best counter to Tapu Fini?

Regieleki with Lock On and Thunder Cage, worth 25.6 damage per second against Tapu Fini's own defense. The full ranking is above.