You will actually start to fish - weird, huh? Sadly, there really isn't anything to this trick. Stand next to a statue and use a fishing rod. Wild Pokemon will not attack you in the area you cut. Use 'cut' and it will cut a two by two area. Once you get the HM 'cut', your Pokemon can cut down grassy areas. To win big, play each machine 4 times, and if it hits 2 or more, then stick with that one, because it's probably hot. All of the slot machines have different odds, which change every time.
