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Beach Cave (かいがんのどうくつ Coastal Cave) is the first dungeon in Pokemon Mystery Dungeon: Explorers of Time, Darkness, and Sky. It consists mainly of -type pokemon. The protagonist enters this dungeon with their partner to retrieve the partner's Relic Fragment from Koffing and Zubat, who are also this dungeon's bosses.
Beach Cave is the only dungeon that can be reached in two different ways: the first being through the usual way east of Treasure Town, the second way being passing through the beach and entering the dungoen at the end of the beach.