Type matchups and best counters for Gastly in Pokémon Polished Crystal. Learn which Pokémon can effectively counter Gastly and what types to use against it.
Types that deal increased damage to Gastly. Use these types to counter it effectively.
Types that Gastly resists or is immune to. Avoid using these types against it.
Pokémon that have type advantages against Gastly, either offensively or defensively.