You get them from the second chapter of the Confusion Dance quest. You have to save little ducks from monsters that spawn. *dont use AOE's cause it'll kill the ducks too* Once you get the duck gift box, you take it to the NPC in giantwood forest and trade in your box with 20 peppermint, 100 peeled prawn, and an intermediate evo. stone. 2 Hours later, go back, and you have your duck!