Pokémon : S21 | E12 – The Professors’ New Adventure!

Our heroes return to the Pokémon School, where Lillie thanks everyone for their help saving her mother. Later, during a walk on the beach, Professor Kukui asks Professor Burnet to marry him! They aren't planning a wedding ceremony, but our heroes have other ideas...a surprise ceremony awaits! With the assistance of Principal Oak the ceremony is successfully held. Then Lusamine asks the Pokémon School class to join the Ultra Guardians, a group that will protect Alola from Ultra Beasts. Just after the bouquet toss, Solgaleo appears! Ash gets his wish and thanks the Legendary Pokémon for all its help, and he looks forward to seeing it again someday. At the end of the episode an Ultra Beast is shown escaping through the warmhole. (Source: Wikipedia)