There are two ways to get Truffles. It must be during Fall to work.
You can either take your pig outside and wait for it to find a Truffle or you can try to find one yourself.
Go to the video under Related Links for a tutorial.
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You can find the moon stone in Harvest Moon Magical melody in the Cave. (I don't believe that their are moon stones in the underground lake, but hey it is wroth a shot.)
You can't.
Harvest Moon Magical Melody; available for Game-cube and Wii.
you can't in that game.