Grand Super Star
From the Super Mario Wiki
A Grand Super Star is a Skill Item in Puzzle & Dragons: Super Mario Bros. Edition. It raises the Skill levels of teammates whose Skill levels have reached level 4 using Super Stars such as both forms of Peach, Bob-ombs, and all types/forms of Lakitus and Boos. Grand Super Stars can be obtained by opening up ? Blocks; winning them from the Lucky ? Blocks game in Toad Houses; or from defeating a Double Lakitu with a 10+ Combo attack.