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Pokémon BlueGB · 1996Pokémon GoldGBC · 1999Pokémon SilverGBC · 1999Pokémon CrystalGBC · 2000Pokémon FireRedGBA · 2004Pokémon EmeraldGBA · 2004
3 Pokémon in Pokémon Blue that deal 2× damage toghost
Hit it with
ghost
gastly
gastly
ghostpoison
haunter
haunter
ghostpoison
gengar
gengar
ghostpoison

Counter another type

normalfirewaterelectricgrassicefightingpoisongroundflyingpsychicbugrockdragon