Pokémon/Attack chart

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Θ = Super Effective (x2)
O = Normal effectiveness (x1)
∆ = Poor (x0.5)
X = No effect (x0)

Pokémon Type	Normal	Fire	Water	Electric	Grass	Ice	Fighting	Poison	Ground	Flying	Psychic	Bug	Rock	Ghost	Dragon	Dark	Steel
Pokémon Move
Normal No													∆	X			∆
Fire Fir		∆	∆		Θ	Θ						Θ	∆		∆		Θ
Water Wa		Θ	∆		∆				Θ				Θ		∆
Electric El			Θ	∆	∆				X	Θ					∆
Grass Gra		∆	Θ		∆			∆	Θ	∆		∆	Θ		∆		∆
Ice Ic		∆	∆		Θ	∆			Θ	Θ					Θ		∆
Fighting Fig	Θ					Θ		∆		∆	∆	∆	Θ	X		Θ	Θ
Poison Po					Θ			∆	∆			Θ	∆	∆			X
Ground Gro		Θ		Θ	∆			Θ		X		∆	Θ				Θ
Flying Fl				∆	Θ		Θ					Θ	∆				∆
Psychic Ps							Θ	Θ			∆					X	∆
Bug Bu		∆			Θ		∆	∆		∆	Θ			∆		Θ	∆
Rock Ro		Θ				Θ	∆		∆	Θ		Θ					∆
Ghost Gh	X										Θ			Θ		∆	∆
Dragon Dr															Θ		∆
Dark Da							∆				Θ			Θ		∆	∆
Steel St		∆	∆	∆		Θ							Θ				∆

Note that for Pokémon with duplicated types, multiply the two levels of effectiveness by each other. This is explained in detail on the Dual type attack chart.

Also note that in the First Generation games, Red, Blue, Green, and Yellow, some weaknesses/resistances are different:

• Ice
  moves are 1x effectiveness vs
  Fire
  , not 0.5x
• Bug
  moves are 2x effectiveness vs
  Poison
  , not 0.5x
• Ghost
  moves are 0x effectiveness vs
  Psychic
  , not 2x
• Dark
  and
  Steel
  types do not exist.