Poltergust G-00

The Poltergust G-00 is the newest Poltergust model used by Luigi in Luigi's Mansion 3 and Super Smash Bros. Ultimate. Its name appears to be a pun on "goo," referring to Gooigi.

Super Smash Bros. Ultimate
The Poltergust G-00 was teased in Super Smash Bros. Ultimate's August 8 Nintendo Direct, specifically in Simon Belmont and Richter Belmont's reveal trailer, where Luigi was shown using its Strobulb and Suction Shot. Luigi uses the Suction Shot's plungers in an attempt to ward off a mummy horde in Dracula's Castle, but his efforts fail.

Later in the November 1 Nintendo Direct, the Poltergust G-00 was officially confirmed as a moveset element for Luigi, replacing his previous grab and throws. For his grab, Luigi uses the Suction Shot from the Poltergust G-00; as a result, it has much more range than Luigi's previous grab, and it also grants him a grab aerial. Luigi's up throw directly involves the Poltergust G-00, as he uses it to eject opponents at a high upward distance. His forward and back throws were also given new animations to fit his new grab, as he now slams the opponent with the Poltergust G-00 during both these throws. Lastly, his Final Smash now utilizes the Poltergust G-00, with it replacing the Poltergust 5000 function-wise from the previous game.

Luigi's Mansion 3
The Poltergust G-00 debuts in a Mario franchise game with its appearance in Luigi's Mansion 3, being used by Luigi. The Poltergust G-00 uses the Strobulb equipment from previous Luigi's Mansion games, the Dark-Light Device from Luigi's Mansion: Dark Moon, and has the aforementioned ability to fire grabable toilet plungers with the Suction Shot. With the Burst function, the Poltergust G-00 creates a shockwave that can blow away enemies, and allow Luigi to jump with it. Similarly to what it does as Luigi's forward and back throws in Super Smash Bros. Ultimate, the Poltergust G-00 can slam ghosts on the ground or into each other. The glass cylinder in the back also serves as a storage tank for Gooigi. The Power Gauge is retained, but instead of a level-type gauge, the gauge is in a circular form, and if the player presses when the gauge is fully charged, the Slam function can be carried out. The Slam is a new function that slams ghosts to the ground to lower their HP. If there is another ghost in close vicinity to the ghost being slammed, and if that ghost gets hit, the ghost's HP will lower.

Mario Kart Live: Home Circuit
Although the Poltergust G-00 does not appear in Mario Kart Live: Home Circuit, a kart that is based on it appears in the game.

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 * Luigi's Mansion 3 Trivia Quiz : "Professor E. Gadd gives Luigi the upgraded Poltergust G-00, which sports new functions like Slam, Burst, and Suction Shot."