Check out the 62nd episode here.
After returning to Versal City and finding the gym leader absent once again, Ash, Brock, and Brenda decide to take a trip to Frostover Island, an island off the coast of Versal known for being freezing cold year round. Once there, they find and amazing discovery from the ancient past.
Also, the Pokédex and Tenno League pages have been updated accordingly.