Weak toFightingBugFairy ×1.6

Attacker	Type	Moveset	DPS
Lucario	FightingSteel	Force PalmAura SphereLegacy	33.7
Pheromosa	BugFighting	Bug BiteFocus Blast	32.8
Kartana	GrassSteel	Fury CutterSacred Sword	32.1
Terrakion	RockFighting	Double KickSacred SwordLegacy	30.7
Blaziken	FireFighting	CounterAura Sphere	30.5
Enamorus	FairyFlying	Fairy WindDazzling Gleam	28.4
Conkeldurr	Fighting	Force PalmFocus Blast	28.1
Keldeo	WaterFighting	Low KickSacred Sword	27.9
Breloom	GrassFighting	Force PalmDynamic Punch	27.8
Urshifu	Fighting	CounterDynamic Punch	27.5
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	27.4
Marshadow	FightingGhost	CounterClose Combat	26.9

Overcast boosts the Fighting attacks above. Fog boosts Mabosstiff.

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

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

Questions people ask

What is Mabosstiff weak to in Pokémon GO?

Mabosstiff takes 1.6 times from Fighting, Bug and Fairy.

What's the best counter to Mabosstiff?

Lucario with Force Palm and Aura Sphere, worth 33.7 damage per second against Mabosstiff's own defense. The full ranking is above.