Weak toPoisonSteel ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Poison JabSludge Bomb	21.6
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	21.2
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	20.6
Naganadel	PoisonDragon	Poison JabSludge Bomb	20.5
Lucario	FightingSteel	Force PalmMeteor MashLegacy	20.2
Nihilego	RockPoison	Poison JabSludge Bomb	19.5
Roserade	GrassPoison	Poison JabSludge Bomb	19.0
Dialga	SteelDragon	Metal ClawIron Head	18.8
Munkidori	PoisonPsychic	Poison JabSludge Bomb	18.7
Regigigas	Normal	Hidden PowerCrush GripLegacy	18.4
Genesect	BugSteel	Metal ClawMagnet Bomb	18.4
Revavroom	SteelPoison	Poison JabGunk Shot	17.9

Overcast boosts the Poison attacks above. Overcast and Partly cloudy boost Mega Audino.

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

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

Questions people ask

What is Mega Audino weak to in Pokémon GO?

Mega Audino takes 1.6 times from Poison and Steel.

What's the best counter to Mega Audino?

Eternatus with Poison Jab and Sludge Bomb, worth 21.6 damage per second against Mega Audino's own defense. The full ranking is above.