Weak toGroundRockDragon ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	34.4
Rayquaza	DragonFlying	Dragon TailBreaking SwipeLegacy	25.2
Haxorus	Dragon	Dragon TailBreaking SwipeLegacy	25.2
Palkia	WaterDragon	Dragon TailDraco Meteor	25.2
Salamence	DragonFlying	Dragon TailDraco Meteor	25.0
Baxcalibur	DragonIce	Dragon BreathGlaive RushLegacy	24.7
Dragonite	DragonFlying	Dragon TailDraco MeteorLegacy	23.8
Dragapult	DragonGhost	Dragon TailBreaking Swipe	23.7
Garchomp	DragonGround	Dragon TailBreaking Swipe	23.3
Glimmora	RockPoison	Rock ThrowMeteor Beam	22.9
Reshiram	DragonFire	Dragon BreathDraco Meteor	22.9
Dialga	SteelDragon	Dragon BreathDraco Meteor	22.9

Windy boosts the Dragon attacks above. Clear and Windy boost Mega Charizard X.

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

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

Questions people ask

What is Mega Charizard X weak to in Pokémon GO?

Mega Charizard X takes 1.6 times from Ground, Rock and Dragon.

What's the best counter to Mega Charizard X?

Eternatus with Dragon Tail and Dynamax Cannon, worth 34.4 damage per second against Mega Charizard X's own defense. The full ranking is above.