Meteor Ghost

Meteor Ghosts are ghosts that can be found by Luigi only in the Observatory of Luigi's Mansion.

Story
When Luigi first enters the Observatory, the first thing he notices is a small telescope. Luigi can then walk towards it and get a better look. When he looks through, he notices a small moon; at which point the Meteor Ghosts try to attack. Luigi is able to suck a Meteor Ghost into the slot of his Poltergust 3000. He can then fire it at the moon, causing the it to explode, revealing a path to Mario's Star.

Trivia

 * The enemy eventually uses the same model of "ball.szp", an unused type of ghost seen in the early pre-releases.