The Scarlet ex expansion was the first main set in the Scarlet & Violet series, released on January 20, 2023, in Japan. It introduced Koraidon ex and other Pokémon ex cards, showcasing the new Terastal mechanic, based on the Terastal phenomenon from the Scarlet & Violet games. The expansion highlighted Pokémon, items, and locations from the games, marking the debut of this new era in the Pokémon TCG. Significant changes included a shift to grey borders, guaranteed holofoil cards in booster packs, and updated subcategories for Trainer cards. Scarlet ex set the stage for an exciting new chapter in the TCG.