Beanstone

a Beanstone is an item that Mario and Luigi find in Mario & Luigi: Super Star Saga. It is optinal, however. It appears in random spots of the Bean Bean Castle Town, after talking to a BeanBean scholar. If the Mario Bros. collect them all and return them to the scholar, then the scholar will give the mario bros. a Bros. Rock (Badge). After Cackletta's second invasion of the place, then this sidequest is not open.