From the Super Mario Wiki
“Fer the luvva dirt, make that yappy dog be QUIET!”
Skeleton Ghosts are, as their name implies, skeletal ghosts appearing only in the game Luigi's Mansion. A skeleton ghost named Mr. Bones is first encountered in the Boneyard where it was disturbed by Spooky's barking. They attack by throwing bones at Luigi. Skeleton Ghosts were also found in the Graveyard and had to be defeated to lure out Bogmire. More Skeleton Ghosts were encountered in the Telephone Room. These ghosts have thirty HP. Skeleton Ghosts could also, like all other normal ghosts, be defeated by one of the three Elements.
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