Treasure Beach (Japanese: たからのはまTreasure Beach) is a small area to the south of One Island, extending from the Seagallop Ferry dock to a small island to the south's northern beach. The actual treasure beach itself is this beach on the north coast, where Trainers can find regenerating items that have washed up on shore.
This small yet useful area is located south of One Island and accessed by surfing south of the town's Seagallop Ferry dock. It is a mostly water route with a single Trainer in the water, a Swimmer using two Seel and a Dewgong. At the southern end of the route is the actual Treasure Beach, so named because of the many strange and valuable items that wash up on its shore. There is also a single person on the island, beachcombing for treasure. The actual treasure is located in a small area with scattered tall grass patches. One person tells the player that they should regularly come here for beachcombing. Items can be found in random places using the Itemfinder, and they may regenerate after the player has walked a certain amount of steps.