From the Super Mario Wiki, the Mario encyclopedia
The Goldfish Bowl is an item in the game Super Paper Mario. Pook gives the Goldfish Bowl to Mario, Peach and Bowser in Flipside because they managed to find a better spot for Captain Gills the goldfish to stay in. After Mario and co. free the goldfish, the bowl can be used as a Helmet so Mario and co. can breathe in space.
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