Weak toGrassElectric ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	27.6
Zeraora	Electric	Volt SwitchPlasma Fists	23.7
Kartana	GrassSteel	Razor LeafLeaf Blade	23.6
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	23.1
Xurkitree	Electric	Thunder ShockDischarge	22.9
Roserade	GrassPoison	Magical LeafLeaf Storm	20.1
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	20.0
Deoxys	Psychic	Charge BeamThunderbolt	19.9
Electivire	Electric	Thunder ShockWild Charge	19.8
Zarude	DarkGrass	Vine WhipPower Whip	19.7
Rillaboom	Grass	Razor LeafFrenzy PlantLegacy	19.5
Raikou	Electric	Volt SwitchWild Charge	19.3

Rainy boosts the Electric attacks above. Rainy boosts Suicune.

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

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

Questions people ask

What is Suicune weak to in Pokémon GO?

Suicune takes 1.6 times from Grass and Electric.

What's the best counter to Suicune?

Regieleki with Lock On and Thunder Cage, worth 27.6 damage per second against Suicune's own defense. The full ranking is above.