You will treasure the power when you play the Pokémon TCG: Diamond & Pearl—Mysterious Treasures expansion! Mysterious Treasures is the name given to the second main expansion of the Diamond & Pearl Series of the Pokémon Trading Card Game. In Japan, it was released as Secret of the Lakes, the second expansion in the Pokémon Card Game DP Era.

Mysterious Treasures (Secret of the Lakes) is the second TCG expansion set of the Diamond and Pearl series. It was released on 2 March 2007 in Japan and 22 August 2007 in the US. This expansion set contains 131 cards in Japanese and 124 cards in English. Seek new Pokémon and you shall find...

Pokémon TCG: Diamond & Pearl—Mysterious Treasures features more than 120 new cards and remains compatible with previous releases.

Pokémon TCG: Diamond & Pearl—Mysterious Treasures (Japanese: 湖の秘密 Secret of the Lakes) is the name given to the second main expansion of cards from the Diamond & Pearl Series of the Pokémon Trading Card Game (the DP Era in Japan). The set continues to feature Generation IV Pokémon and Pokémon LV.X in the card game.