From the Super Mario Wiki, the Mario encyclopedia
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The Rose is a purple flower that only appears in the Game Boy Advance remake of Donkey Kong Country 3: Dixie Kong's Double Trouble!. It is required to complete a trade that allows Dixie and Kiddy Kong to obtain a Banana Bird.
In Lake Orangatanga, Bachelor is preparing for a "hot date" and needs a Rose and Box of Chocolates to give to his date. He gives the Flupperius Petallus Pongus to the Kongs, hoping that they can make a use out of it. The Kongs can give that flower to Bramble in exchange for the Rose.
When the Kongs return to Bachelor with both the Box of Chocolates and Rose, he rewards them with a Banana Bird.