Weak toFightingGroundSteelWaterGrass ×1.6

Attacker	Type	Moveset	DPS
Lucario	FightingSteel	Force PalmAura SphereLegacy	66.3
Kartana	GrassSteel	Razor LeafLeaf Blade	63.5
Pheromosa	BugFighting	Low KickFocus Blast	60.7
Terrakion	RockFighting	Double KickSacred SwordLegacy	60.5
Blaziken	FireFighting	CounterAura Sphere	60.0
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	58.0
Inteleon	Water	Water GunHydro CannonLegacy	57.2
Kyogre	Water	WaterfallOrigin PulseLegacy	57.0
Breloom	GrassFighting	Force PalmGrass KnotLegacy	57.0
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	56.3
Groudon	Ground	Mud ShotPrecipice BladesLegacy	55.9
Conkeldurr	Fighting	Force PalmFocus Blast	55.3

Overcast boosts the Fighting attacks above. Partly cloudy boosts Rockruff.

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

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

Questions people ask

What is Rockruff weak to in Pokémon GO?

Rockruff takes 1.6 times from Fighting, Ground, Steel, Water and Grass.

What's the best counter to Rockruff?

Lucario with Force Palm and Aura Sphere, worth 66.3 damage per second against Rockruff's own defense. The full ranking is above.