Enhanced Expansion Pack: Battle Region is a subset containing 93 cards and was first 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. Combined with the standard set, this creates a master set of 138 cards.
The subset was later released in Taiwan and Hong Kong on March 11, 2022, in Indonesia on April 22, 2022, in South Korea on April 27, 2022, and in Thailand on April 29, 2022.