The cave between Route 3 and Route 4. Moon Stones can be found here, Jessie & James fight you at level 14, and at the end a scientist offers a choice of ONE fossil: the Helix Fossil (Omanyte) or the Dome Fossil (Kabuto).
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Where something is met, and how. Characters are here as well as creatures: the guide records where Professor Oak stands and where each Gym Leader is fought.