Grass and Ground
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His weaknesses are rock and lightning
Dark Pokemon are Psychic Pokemon's weakness.
Ice type Pokemon in Pokemon Pearl are weak to fighting type moves, rock type moves steel type moves and fire type moves. This has not changed since the first generation (Pokemon Red and Blue/Green) when the steel type did not exist.
Gastly is a ghost/ poison type, so any psychic or ghost type will be super effective against it.
The weakness of flying type Pokemon is Ice, Electric and Rock.