From the Super Mario Wiki
Dark Boomboxers are pitch black counterparts of Boomboxers found in Super Paper Mario. They are found in the Flopside Pit of 100 Trials. Dark Boomboxers attack by emitting loud sound waves from their head, which is shaped like a boom box. Unlike regular Boomboxers, Dark Boomboxers shoot six sound waves at once. Like regular Boomboxers, Dark Boomboxers have high HP, and get stunned temporarily after detonating Boomer.
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