From the Super Mario Wiki, the Mario encyclopedia
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Peach-bots are robots that appear in the Game Boy Advance game Mario & Luigi: Superstar Saga and its 3DS remake, Mario & Luigi: Superstar Saga + Bowser's Minions. They were created by the evil witch Cackletta and her accomplice, Fawful. The Peach-bots are made to look like Princess Peach and are programmed to play a perfect copy of her voice, which was stolen during the events of the game. Cackletta intends to use the voice to awaken the Beanstar, a magical object which is said to grant wishes and fulfill anyone's greatest desires. Cackletta and Fawful go to Woohoo Hooniversity in secret to awaken the Beanstar, where Fawful is making some final adjustments to one of the three Peach-bots. He then gives the cue to Cackletta to activate them. For a few seconds, everything seems to be going to plan, but instead of peacefully awakening the Beanstar, it becomes very angry and crashes around the area, creating holes in the floor, which the Peach-bots fall through.
Later, after Mario and Luigi find the Beanstar in the university's basement and fight Popple and Rookie for it, a Peach-bot which did not quite make it to the floor then falls, with its voice angering the Beanstar again, causing it to fly off and break up in four pieces, which scatter all over the Beanbean Kingdom.
It is revealed later on that the stolen voice actually belonged to Birdo, as the princess was switched before Cackletta and Fawful stole her voice. This explains why the Peach-bots' voice drove the Beanstar mad, instead of awakening it as originally intended.