Weak toFightingRockSteelFire ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	52.7
Lucario	FightingSteel	Force PalmAura SphereLegacy	44.7
Reshiram	DragonFire	Fire FangFusion FlareLegacy	43.8
Pheromosa	BugFighting	Low KickFocus Blast	40.9
Terrakion	RockFighting	Double KickSacred SwordLegacy	40.8
Blaziken	FireFighting	CounterAura Sphere	40.4
Chandelure	GhostFire	Fire SpinOverheat	40.1
Cinderace	Fire	Fire SpinPyroball	39.5
Volcarona	BugFire	Fire SpinOverheat	39.1
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	39.1
Darmanitan	Fire	Fire FangOverheat	39.0
Kartana	GrassSteel	Fury CutterSacred Sword	38.6

Overcast boosts the Fighting attacks above. Snow boosts Cetitan.

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

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

Questions people ask

What is Cetitan weak to in Pokémon GO?

Cetitan takes 1.6 times from Fighting, Rock, Steel and Fire.

What's the best counter to Cetitan?

Blacephalon with Incinerate and Mind Blown, worth 52.7 damage per second against Cetitan's own defense. The full ranking is above.