Weak toFightingRockGrassElectric ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	30.5
Lucario	FightingSteel	Force PalmAura SphereLegacy	27.3
Zeraora	Electric	Volt SwitchPlasma Fists	26.2
Kartana	GrassSteel	Razor LeafLeaf Blade	26.1
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	25.6
Xurkitree	Electric	Thunder ShockDischarge	25.3
Pheromosa	BugFighting	Low KickFocus Blast	25.0
Terrakion	RockFighting	Double KickSacred SwordLegacy	24.9
Blaziken	FireFighting	CounterAura Sphere	24.7
Breloom	GrassFighting	Force PalmGrass KnotLegacy	23.4
Glimmora	RockPoison	Rock ThrowMeteor Beam	23.1
Rampardos	Rock	Smack DownRock Slide	22.9

Rainy boosts the Electric attacks above. Rainy and Snow boost Iron Bundle.

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

Iron Bundle's moveset, CP and shiny All counters Raid board

Questions people ask

What is Iron Bundle weak to in Pokémon GO?

Iron Bundle takes 1.6 times from Fighting, Rock, Grass and Electric.

What's the best counter to Iron Bundle?

Regieleki with Lock On and Thunder Cage, worth 30.5 damage per second against Iron Bundle's own defense. The full ranking is above.