Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness

Pokémon Mystery Dungeon: Explorers of Time (ポケモン不思議のダンジョン 時の探検隊) and Pokémon Mystery Dungeon: Explorers of Darkness (ポケモン不思議のダンジョン 闇の探検隊) are a matched pair of Pokémon games for the Nintendo DS. The two games were released in Japan on September 13 2007, and is set to be released in North America in quarter 2 of 2008.

Story
One night, after taking a personality test, a player Pokémon falls into the ocean and washes up on a sandy beach, eventually falling unconscious. The partner is an aspiring Pokémon who wishes to become a famous explorer, but cannot join the Wigglytuff Guild, the official exploration club, without another member. After helping the partner defeat two Pokémon criminals, a Koffing and a Zubat, your partner suggest that you form an exploration team, and you accept.

Over the course of the game, you try to uncover the mysteries of your coming to this world, as well as thwarting an evil plot to control time by a mysterious Pokémon villain.