From the Super Mario Wiki
The Rocket Bucket is an aircraft used by Wario in Wario Land: Shake It! Wario can use the Rocket Bucket to fly to elevations he normally cannot reach. The Rocket Bucket is elevated by pressing and holding the 2 button, and the player can steer it by tilting the Wii Remote. Wario can exit the Rocket Bucket by pressing Up on the D-pad. Wario can break the Rocket Bucket by charging into it, attempting to fly it to the next screen, or by touching any surface covered in spikes.
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