Weak toFightingBugFairy ×1.6

Attacker	Type	Moveset	DPS
Lucario	FightingSteel	Force PalmAura SphereLegacy	34.5
Pheromosa	BugFighting	Bug BiteFocus Blast	33.5
Kartana	GrassSteel	Fury CutterSacred Sword	32.8
Terrakion	RockFighting	Double KickSacred SwordLegacy	31.4
Blaziken	FireFighting	CounterAura Sphere	31.2
Enamorus	FairyFlying	Fairy WindDazzling Gleam	29.1
Conkeldurr	Fighting	Force PalmFocus Blast	28.7
Keldeo	WaterFighting	Low KickSacred Sword	28.5
Breloom	GrassFighting	Force PalmDynamic Punch	28.4
Urshifu	Fighting	CounterDynamic Punch	28.2
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	28.0
Marshadow	FightingGhost	CounterClose Combat	27.5

Overcast boosts the Fighting attacks above. Fog boosts Thievul.

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

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

Questions people ask

What is Thievul weak to in Pokémon GO?

Thievul takes 1.6 times from Fighting, Bug and Fairy.

What's the best counter to Thievul?

Lucario with Force Palm and Aura Sphere, worth 34.5 damage per second against Thievul's own defense. The full ranking is above.