From the Super Mario Wiki
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A Double Medal is one of the many obtainable items in the Coinathlon mode of Mario Party: Star Rush. Like the Coin Bag and the Coin Trio, it is an item that benefits the player rather than hurts their opponents, and players in first place cannot receive this item. When activated, it temporarily doubles the amount of coins obtained for a period of time, represented by a blue aura around the top screen. When the Double Medal is about to run out, the blue aura flickers and eventually vanishes. When a Diddy Kong amiibo is used in Coinathlon, Diddy Kong always receives two of this item when he starts out.