Fighting type and bug type are strong against dark type Pokémon.
Weak: Psychic Strong: Fighting
Sigilyph is weak against Rock, Ghost, Electric, Ice, and Dark type Pokemon.
Dark-type pokemon are resistant to Dark and Ghost moves, and are unaffected by Psychic.
dark type Pokemon are said to be created after team rocket. some dark types are umbreon and tyranitar
Fighting type and bug type are strong against dark type Pokémon.
Grass
Dark type are very strong to physic pokemon. Grass,fire and water are weak(not very strong).
Flying And rock
Weak: Psychic Strong: Fighting
Psychic Pokemon are strong against fighting and posion types, but they are weak against dark type. The best basic psychic Pokemon is Alakazam
Dark, bug, and ghost.
any Pokemon that is a dark type any Pokemon that is a dark type
The most effective type to use is Ghost, Bug, or Dark.
light type does not exist, but if such Type were real it's highly likely that Light would be strong against Dark and Ghost and weak against Dark.
a dark-type Pokemon at least at level 47-50 that knows a strong dark move ( dark pulse is recommended).
Dark, ghost and bug. But be careful, as Phycic Pokemon can hit ghost Pokemon hard as well. Dark types don't get affected by phycic attacks, but, although there are no dark-types around, use dark type moves like bite and crunch.