After you find the piece of paper in the Wulinshu at man mo temple go to pigeon park and talk to eileen who is practising kung fu. After that go speak to Izumi in the tomato convenience store in the golden quarter. Then go to the green market quarter, and down the alley to the left of the green market pawnshop. Collect the bronze medal, which gives you access to the 3rd floor in the pine game arcade in golden qr. go there and defeat eileen and izumi in battle and win a silver medal. Now go back to izumi and she will take you to a duck race. after this go back to the tree where you catch leaves. catch 2, twice in a row, or three at once and a duck will quack. Catch the feather which falls. You will catch a duck. Speak to izumi and you can race it, upgrade its stats and eventually win a gold medal. Enjoy!