It's weeknesses are ghost and dark.
The light.
Its weaknesses are ghost, bug and dark types.
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.
Spiritomb is Ghost and Dark Type. Extra Information: To catch Spiritomb, you need to place an Odd Keystone in the Hallowed Tower in Route 209 and have 32 conversations with a friend underground (You will catch Spiritomb in 25 lv.) Hope I helped :)