Game Boy Color Cartridge Pokémon Trading Card Game (GB) with Case Operation confirmed & internal battery replaced, so data saving is confirmed to be problem-free. However, please understand that as this is an old item, we cannot guarantee all functions. *If save data remains, please delete or overwrite it. We offer bundle discounts, so please take a look at our other Game Boy related items. Please note that this item is also listed on other sites, so we apologize in advance if it is sold out due to a timing difference.