Skeleton Ghosts (or simply "Skeletons" in the strategy guide) are ghosts made of bones in Luigi's Mansion.
It's a good idea to use any element to keep the Skeleton from throwing its bone, letting it cancel its attack.
In the Telephone Room, there are two Skeletons Luigi awakened from the chests and this is the only indoor room to feature them.
Luigi shouldn't underestimate the element meter when fighting as it could be a threat and they throw bones at him.
- Unlike the Boo or Portrait Ghost, the Skeleton Ghost named Mr. Bones was the only normal ghost to have speaking lines.