Gastly in Pokémon GO
By Matt · Updated Quick answer
Gastly is Ghost and Poison type, so it's weak to Dark, Ghost, Ground and Psychic.
What is Gastly weak to?
Gastly is Ghost and Poison type, so it takes extra damage from Dark, Ghost, Ground and Psychic attacks.
Defending Gastly 
Ghost
Poison
GhostPoison Hits it hard
-
Dark160% damage 1.6× - Ghost160% damage 1.6×
-
Ground160% damage 1.6× -
Psychic160% damage 1.6×
Bounces off
-
Fighting24.4% damage -
Bug39.1% damage -
Normal39.1% damage - Poison39.1% damage
-
Fairy62.5% damage -
Grass62.5% damage
Leave Fighting, Bug, Normal, Poison, Fairy and Grass attackers at home: Gastly resists them, and Fighting, Bug, Normal and Poison barely scratch it.
Is Gastly worth it?
Evolves into Gengar; Mega Gengar is number one Poison (18.95 DPS, 322.5 TDO) and number three Ghost (21.84 DPS, 371.8 TDO) on DialgaDex. Matt's take: Mega Gengar is number one Poison and number three Ghost on DialgaDex, so Gengar candy is never wasted.
From Pokémon GO This Week: 26 October to 1 November 2026, 26 Oct
From Pokémon GO This Week: 26 October to 1 November 2026, 26 Oct
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FAQ
What is Gastly weak to in Pokémon GO?
Gastly is Ghost and Poison type. It's weak to Dark, Ghost, Ground and Psychic. It resists Fighting, Bug, Normal, Poison, Fairy and Grass.
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