Pokémon the Series: Sun & Moon Episode 17: Crystal-Clear Sleuthing!
Episode 17 of 146 of Pokémon the Series: Sun & Moon, aired March 9, 2017, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Professor Kukui and Rotom Dex are big fans of the TV show Alolan Detective Laki, and Rotom even has a blond wig so it can pretend to be the star. When Ash’s Electrium Z goes missing, Rotom excitedly takes the case!