From the Super Mario Wiki, the Mario encyclopedia
The Rainy Balloons are an unlockable glider in Mario Kart Tour. They are a variation of the Cloud Glider with a darker color scheme resembling Lakithunder's cloud and are classified as a tour-exclusive High-End glider. They are the signature glider of King Boo (Luigi’s Mansion), Hammer Bro, and Boomerang Bro. Like the Cloud Glider, striking other drivers with Lightning grants more points than usual upon using this glider.
The glider was exclusively obtainable during the Halloween Tour and was part of the second week's spotlight alongside King Boo (Luigi's Mansion) and the Ghost Ride. It was also made available in the Hammer Bro Tour and was part of the first week's spotlight, alongside Hammer Bro and Boomerang Bro.
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