Ghost Catcher

The Ghost Catcher is a Large kart in Koopa Kart Wii and Koopa Kart 8. It resembles King Boo. It does not have a bike counterpart in its debut appearance, but in Koopa Kart 8, its bike counterpart is the Piranha Baiter. It can be unlocked by winning the 50cc Yellow Shell Cup. It is the Koopa Kart counterpart to the Piranha Prowler.

Description
"The Ghost Catcher is the heaviest vehicle in the game and is fast, though its other stats are below average. This will be your gift for winning the 50cc Yellow Shell Cup." - Koopa Kart Wii in-game description