Weak toBugGhostIceDragonDarkFairy ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	30.6
Baxcalibur	DragonIce	Ice FangGlaive RushLegacy	23.7
Blacephalon	FireGhost	AstonishShadow Ball	22.9
Rayquaza	DragonFlying	Dragon TailBreaking SwipeLegacy	22.5
Haxorus	Dragon	Dragon TailBreaking SwipeLegacy	22.5
Palkia	WaterDragon	Dragon TailDraco Meteor	22.5
Salamence	DragonFlying	Dragon TailDraco Meteor	22.2
Pheromosa	BugFighting	Bug BiteBug Buzz	22.1
Dragapult	DragonGhost	Dragon TailShadow Ball	21.4
Dragonite	DragonFlying	Dragon TailDraco MeteorLegacy	21.2
Chien-Pao	DarkIce	SnarlBlizzard	20.8
Garchomp	DragonGround	Dragon TailBreaking Swipe	20.8

Windy boosts the Dragon attacks above. Windy boosts Mega Latios.

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

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

Questions people ask

What is Mega Latios weak to in Pokémon GO?

Mega Latios takes 1.6 times from Bug, Ghost, Ice, Dragon, Dark and Fairy.

What's the best counter to Mega Latios?

Eternatus with Dragon Tail and Dynamax Cannon, worth 30.6 damage per second against Mega Latios's own defense. The full ranking is above.