It's weeknesses are ghost and dark.
The light.
Its weaknesses are ghost, bug and dark types.
The weakness is when you do not believe in them, and you only love the holy ghost, God
Bug, dark, and ghost.
Ghost type is weak to Ghost type and Dark type moves.
Im pretty sure ghost are weak against other ghost attacks and dark attacks.
Normal has the least amount of weaknesses with only one fighting but it isn't super effective againist anything and it doesn't effect ghost and ghost type moves do not effect it but otherwise, there a several different Pokemon types which have two weaknesses.
they are weak to fighting and bug. They are immune to psychic. They resist dark and ghost. They have no weaknesses if they are dark and ghost.
Spiritomb is Dark/Ghost and has no type weaknesses.
the best two weaknesses are 1:grass 2:water types.
Giratina's weaknesses are Ice, Ghost, Dragon and Dark.
Mismagius is a Ghost type. It evolved from Misdreavus with the help of a dusk stone. Therefore it's weaknesses are (2x): Dark and Ghost. However, it's immune against Fighting and Normal types and when it has the ability Levitate, it's also immune against Ground.