Walkthrough
After reaching the Ballonlea Gym, you will learn that Bede is now the new Gym Leader. He will inform that he doesn't need your help since he has already taken down plenty of Dynamaxed Pokemon before, and to prove it, he will challenge your trainer to another battle.
Gym Leader Bede: Level 61 Mawile, Level 61 Gardevoir, Level 62 Galarian Rapidash, Level 63 Hatterene
After defeating Bede, he will leave to defeat the Dynamaxed Pokemon all by himself. Opal will arrive and gift your trainer with both her Rare League Card and Bede's Rare League Card.