Paladin of the Snow Queen
They should have just had Diglett and Dugtrio do the "Diglett dig Diglett Dig TRio TRio Trio" song the entire episode. That said, Meowth's attempt at music was so bad it crossed the line into humorous. Also, 2 of the Dugtrio are female and one is male? How does that even work if it evolved from a single Diglett?