From the Super Mario Wiki
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It can be obtained by completing the quest Bowser: Accused!. Lip Sync can be used to view close up views of various characters' mouths. The characters in Lip Sync include Mario, Princess Peach, a Boo, and a Goomba. The player can change the character by pressing a direction on the . The player can also cause the characters' mouths to move by pressing and releasing the or button.
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