Crimson and Crimson is the first expansion in the Crimson & Crimson series, which was first introduced during the 2022 Pokémon World Championships, and celebrates the return of the game mechanics of Pokémon-ex.It celebrates the return of the Pokémon-ex game mechanic, which can appear at any stage of evolution and have high HP and powerful attacks and abilities. However, if a Pokémon-ex is incapacitated, the opponent takes two Prize cards instead of one.

The Pokémon Company International also unveiled some improvements to the card design that will be introduced with the Crimson and Purple expansion. The yellow borders of the Pokémon Trading Card Game cards are now grey to match the cards released in Japan. This will make the Pokémon Trading Card Game more consistent around the world, and the illustrations on the cards will stand out even more. In addition, subcategories for Trainer cards - such as Supporter, Item, and Stadium - will appear in the top left corner to be more visible in hand, Basic Energy cards will have another Energy icon in the bottom right corner to make them easier to track during play, and Expansion icons will be replaced with Expansion codes and language codes on all cards.

Assorted item: The item comes in two flavours, blue and purple, and the allocation is random.