‘Legendary Heartbeat’ Secret Rares Leaking! By: Water Pokémon Master Posted 10 months ago to TCG 28 comments The secret rare cards from S3a Legendary Heartbeat are now leaking on social media! The set will release in Japan on July 10th. We may get these cards in our holiday 2020 set. We don’t yet know the name of the set or any official information about it. I believe this is the first Sword & Shield set where they’ve released three full art Trainers. Usually it’s only two. You can continue to refresh this page for new cards or follow my Twitter for updates!