Weak toIce ×2.56RockDragonFairy ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	29.0
Chien-Pao	DarkIce	Powder SnowAvalanche	28.3
Baxcalibur	DragonIce	Ice FangAvalanche	28.2
Mamoswine	IceGround	Powder SnowAvalanche	26.8
Weavile	DarkIce	Ice ShardAvalanche	26.4
Glaceon	Ice	Frost BreathAvalanche	26.1
Kyurem	DragonIce	Dragon BreathGlaciateLegacy	25.1
Jynx	IcePsychic	Frost BreathAvalanche	24.6
Vanilluxe	Ice	Frost BreathAvalancheLegacy	24.0
Frosmoth	IceBug	Powder SnowIce Beam	23.5
Porygon-Z	Normal	Lock OnBlizzard	23.0
Mewtwo	Psychic	Psycho CutIce Beam	22.9

Snow boosts the Ice attacks above. Windy boosts Mega Dragonite.

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

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

Questions people ask

What is Mega Dragonite weak to in Pokémon GO?

Mega Dragonite takes 2.56 times damage from Ice, and 1.6 times from Rock, Dragon and Fairy.

What's the best counter to Mega Dragonite?

Eternatus with Dragon Tail and Dynamax Cannon, worth 29.0 damage per second against Mega Dragonite's own defense. The full ranking is above.