Dawn of Darkness: Rising of the Sword Hero

Following Gou's capture of Scorbunny, the Research Fellows remain in Galar a bit longer thanks to their flight back to Kanto getting delayed. Which leads to the two meeting the younger brother of the region's Champion, a regional variant of Serena, one of the Legendary Pokémon of Galar, and two new (and very unusual) Pokémon to join Ash's team.