Dark-type Pokémon can beat Ghost-type Pokémon and other Ghost-types can also beat Ghost-type Pokémon.
You can beat a ghost type with another ghost type (Like Haunter)
thunder pokemon
Dark type can beat ghost.
Using Dark or Ghost type moves against it
By using ghost and dark type moves, but be careful, if you use a ghost type, then your opponent will also have an advantage!
flying,water,ground,grass,ghost,fire,dragon.
Dark and ghost type moves.
ghost
Types that are strong against Dusclops (ghost) are: Dark Ghost
Ghost-type Pokemon are weak against Dark and Ghost-type attacks. Any type can damage a Ghost-type, except Normal and Fighting-type attacks.
dark and ghost are ideal
The Gym Leader is easy to beat. She mainly use's ghost type Pokemon. Ghost Pokemon are weak against Physic Pokemon. Trust me if i can beat her you can.