Before you can ride the dolphin you must first befriend the Dolphin. Give it fish and wave to it every day.
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you do something
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.