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Obtained: Speak to Nam in Lucca Village during the Rumble with Raditz main story mission
Objective: Find someone who knows about the rock
After speaking with Nam, head past the group of merchants in the middle of the small village to arrive at a pair of purple trucks next to a red shed. Speak to the man wearing the black shirt to trade your rock for an Ammonite Fossil. Then head north past the village and over the top of a waterfall to locate a youth wearing a blue outfit on the northeastern edge of the lake. This person will trade you a Water and Food Capsule for the fossil. Once you receive the items, head back to Nam and speak with him to complete the sub story.
