A Japanese Pokémon Battle Partners booster box contains 30 packs, each with 5 cards, for a total of 150 cards. The set features "Trainer-Pokémon" cards that pair characters with their iconic partners, with over 100 unique cards in total, including special illustration rares and secret rares. The Japanese version is also known for higher quality card stock, especially for its EX cards. 
Key features of a Japanese Battle Partners booster box
Contents: 30 booster packs, with each pack containing 5 cards.
Theme: The set focuses on the synergy between iconic trainers and their Pokémon, with many new trainer cards.
Rarities: The set includes various rare cards, such as special illustration rares and secret rares, with a guarantee of at least one special illustration rare and one secret rare per box.
Quality: The Japanese EX cards are known for having a better quality than their English counterparts.
Card types: The set includes both new trainer and Pokémon cards, along with cards featuring popular characters like Iono, Lillie, and Hop