Weak toPoisonGround ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Poison JabSludge Bomb	36.8
Naganadel	PoisonDragon	Poison JabSludge Bomb	35.0
Groudon	Ground	Mud ShotPrecipice BladesLegacy	34.9
Nihilego	RockPoison	Poison JabSludge Bomb	33.2
Excadrill	GroundSteel	Mud SlapEarthquake	33.1
Mamoswine	IceGround	Mud SlapHigh Horsepower	32.5
Roserade	GrassPoison	Poison JabSludge Bomb	32.4
Munkidori	PoisonPsychic	Poison JabSludge Bomb	31.8
Regigigas	Normal	Hidden PowerCrush GripLegacy	31.4
Rhyperior	GroundRock	Mud SlapEarthquake	31.4
Garchomp	DragonGround	Mud ShotEarthquake	31.1
Landorus	GroundFlying	Mud ShotEarth Power	30.9

Overcast boosts the Poison attacks above. Overcast and Rainy boost Dedenne.

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

Dedenne's moveset, CP and shiny All counters Raid board

Questions people ask

What is Dedenne weak to in Pokémon GO?

Dedenne takes 1.6 times from Poison and Ground.

What's the best counter to Dedenne?

Eternatus with Poison Jab and Sludge Bomb, worth 36.8 damage per second against Dedenne's own defense. The full ranking is above.