When your in Dobuita or the Harbor, go to the pop machine (any) and choose a pop. I would recommend that you choose the blue can on the choices (very left) of the pop machine. If the pop you chose is blue then you need to choose again until you get a can that is yellow. That means that you've won; now take that can to the casier in the Tomato Mart and in your items choose the can in front of the casier. Press A and you will choose a ticket (i chose winning tickets most of the time).