Ep. 128: Step by Step! Dot and Welkamo!!

128

While having food made by Murdock in their hotel room, Roy proposes visiting the Black Rayquaza at the Dragon's Den since not only is it an important part of their search of Pokémon with eighteen Tera types, but there is also Friede's briefcase that is meant for the Sky High Pokémon. (Source: Bulbapedia)