Released on May 24, 2024, Twilight Masquerade is the sixth English main expansion set from the Pokémon TCG: Scarlet & Violet series. It is the combined English counterpart to the Japanese expansion sets, Mask of Change and Crimson Haze.
Twilight Masquerade introduces the masked Legendary Pokémon Ogerpon to Pokémon TCG, as well as other Pokémon and trainers from the land of Kitakami, the main setting of the Scarlet and Violet mainline games' first DLC, the Teal Mask.
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Official Pokémon TCG summary:
A Festival of Mischief & Mystery!
Welcome to the land of Kitakami, where people and Pokémon live harmoniously with nature. Folktales abound, but not all is as it seems... Uncover the mystery of the masked Legendary Pokémon Ogerpon, appearing as four fearsome types of Tera Pokémon ex, and team up with more newly discovered Pokémon, like Bloodmoon Ursaluna ex and Sinistcha ex. Growing in power, Greninja, Dragapult, and Magcargo dazzle as Tera Pokémon ex, and more ACE SPEC cards round out the festivities in the Pokémon TCG: Scarlet & Violet—Twilight Masquerade expansion!