Weak toFlyingFirePsychicIce ×1.6

Attacker	Type	Moveset	DPS
Deoxys	Psychic	Zen HeadbuttPsycho Boost	60.9
Blacephalon	FireGhost	IncinerateMind BlownLegacy	57.8
Mewtwo	Psychic	ConfusionPsystrikeLegacy	49.8
Reshiram	DragonFire	Fire FangFusion FlareLegacy	47.9
Salamence	DragonFlying	Fire FangFly	44.2
Chandelure	GhostFire	Fire SpinOverheat	43.9
Moltres	FireFlying	Fire SpinFly	43.5
Cinderace	Fire	Fire SpinPyroball	43.3
Volcarona	BugFire	Fire SpinOverheat	42.8
Darmanitan	Fire	Fire FangOverheat	42.7
Yveltal	DarkFlying	GustOblivion WingLegacy	42.5
Alakazam	Psychic	ConfusionPsychicLegacy	42.5

Clear boosts the Fire attacks above. Clear and Overcast boost Bulbasaur.

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

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

Questions people ask

What is Bulbasaur weak to in Pokémon GO?

Bulbasaur takes 1.6 times from Flying, Fire, Psychic and Ice.

What's the best counter to Bulbasaur?

Deoxys with Zen Headbutt and Psycho Boost, worth 60.9 damage per second against Bulbasaur's own defense. The full ranking is above.