If your Reffering to pokemon,its fighting a bug
Both Fighting types and Bug types are super effective against Dark types.
Dark type moves such as night shade,shadow punch,etc.are super effective against dark Pokemon.
Ghost and dark.
Ghost and Dark moves would be super-effective against a ghost Pokemon.
Ghost and Dark attacks are super effective against Ghost type pokemon.
If your Reffering to pokemon,its fighting a bug
Both Fighting types and Bug types are super effective against Dark types.
Fighting and Bug types are super effective.
Ghost and Dark-type Pokemon are super effective against Ghost types.
Darkrai = Dark-type, Fighting is super effective against dark.
Dark type moves such as night shade,shadow punch,etc.are super effective against dark Pokemon.
Ghost and dark.
Ghost and Dark moves would be super-effective against a ghost Pokemon.
Dark and Ghost.
Fighting and Bug types
dark, for one, but psychic is super effective against dark to, try doing some research, it will be easy to find out.