Red and Green Goblets
From the Super Mario Wiki, the Mario encyclopedia
The Red Goblet and the Green Goblet are two items found exclusively in Mario & Luigi: Superstar Saga. Mario and Luigi are required to retrieve them to prove to Cork and Cask that they know how to use their new Hammer Bros. Action techniques, Mini-Mario and Luigi Dunk.
The Red Goblet is obtained by Luigi hitting Mario with his hammer, shrinking him and allowing him to fit through a small hole in a wall that leads to the goblet. The Green Goblet is behind a fence that only Luigi can pass under after being hit by Mario's hammer. There is a button in the room that lowers the fence, allowing Mario and Luigi to jump up to the goblet on its elevated table.
In Mario & Luigi: Superstar Saga + Bowser's Minions, Captain Goomba and his squad are asked to find the Red Goblet by Cork and Cask in the Minion Quest: The Search for Bowser level Reclaim the Red Goblet!, as it has been stolen. It is dropped by a red Koopa Paratroopa at the end of the level, and Cork and Cask give Captain Goomba a map to Mother Chuckalola upon returning it to them in order to help him find Iggy.
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