Strength Expansion Pack: Battle Region is a subset containing at least 67 cards and was released in Japan on February 25, 2022. Each booster pack contains six cards. The subset features several Pokémon that made their debut in the core series title Pokémon Legends: Arceus, such as Wyrdeer, Kleavor, and Hisuian regional forms, in addition to supporting characters from the game. The subset also includes more Character Rare Full Art cards featuring Pokémon Trainers following their reintroduction in the VMAX Climax subset, Pokémon with zero-cost attacks for the first time since the Cosmic Eclipse expansion, as well as a new gameplay mechanic: Radiant Pokémon. Radiant Pokémon are comparable to Shining Pokémon from the Neo Series and Pokémon ☆ from the EX Series, in that they depict the Shiny form of a Pokémon and have a Rule Box stipulating only one can be included in a deck. Radiant Pokémon have a Pixel Crosshatch Holofoil pattern and have a new 'K' rarity, likely derived from their Japanese name, Kagayaku. Each common and uncommon card from the subset also has a Mirror Holofoil variant, which feature a Poké Ball pattern.