Weak toGroundIceDragonFairy ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	35.9
Baxcalibur	DragonIce	Ice FangGlaive RushLegacy	27.8
Rayquaza	DragonFlying	Dragon TailBreaking SwipeLegacy	26.4
Haxorus	Dragon	Dragon TailBreaking SwipeLegacy	26.4
Palkia	WaterDragon	Dragon TailDraco Meteor	26.4
Salamence	DragonFlying	Dragon TailDraco Meteor	26.1
Dragonite	DragonFlying	Dragon TailDraco MeteorLegacy	24.9
Dragapult	DragonGhost	Dragon TailBreaking Swipe	24.8
Garchomp	DragonGround	Dragon TailBreaking Swipe	24.4
Reshiram	DragonFire	Dragon BreathDraco Meteor	23.9
Dialga	SteelDragon	Dragon BreathDraco Meteor	23.9
Enamorus	FairyFlying	Fairy WindDazzling Gleam	23.9

Windy boosts the Dragon attacks above. Rainy and Windy boost Mega Ampharos.

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

Mega Ampharos's moveset, stats and CP All counters Raid board

Questions people ask

What is Mega Ampharos weak to in Pokémon GO?

Mega Ampharos takes 1.6 times from Ground, Ice, Dragon and Fairy.

What's the best counter to Mega Ampharos?

Eternatus with Dragon Tail and Dynamax Cannon, worth 35.9 damage per second against Mega Ampharos's own defense. The full ranking is above.