Dive into Diamond & Pearl nostalgia with DP2 Secret of the Lakes (湖の秘密) — the Japanese Pokémon TCG expansion released March 2, 2007, equivalent to English Mysterious Treasures. This classic DP-era set introduced powerful LV.X Pokémon (Level Up mechanic), lake guardians (Azelf, Mesprit, Uxie), and a strong Water/Psychic theme with 123 cards packed with stunning holos, rare LV.X cards, and early Diamond & Pearl artwork.