A factory sealed Japanese booster box of Legendary Heartbeat, a Pokémon TCG expansion from the Sword & Shield era. It is the set that introduced Amazing Rare cards, which keeps it popular with collectors.

• Set: Legendary Heartbeat, set code S3a
• Series: Sword & Shield era, Japanese
• Product type: sealed booster box
• Contents: 30 booster packs, 5 cards per pack
• Notable: first set to feature Amazing Rare cards