Grand Comet Medal
From the Super Mario Wiki
A Grand Comet Medal 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 Comet Medals such as both forms of Rosalina and all types/forms of Cheep Cheeps and Bloopers. Grand Comet Medals can be obtained by opening up ? Blocks; winning them from the Lucky ? Blocks game in Toad Houses; or from defeating "Blooper & Cheep Cheeps", Cheep Chomps, and "Dry Bones & Cheep Cheep"s with a 10+ Combo attack.