DJ Leo is a childhood friend of Professor Kukui and a DJ, who is a part of the DJ group Dig-Dug-Leo (Japanese: ディグダグレオDig-Dug-Leo), previously called Dug-Leo (Japanese: ダグレオDug-Leo) before the AlolanDiglett joined him and his Alolan Dugtrio.
This AlolanDugtrio was first found by Leo when he was younger when he heard it singing in a forest and after meeting with it, he decided to form a DJ duo with it, called Dug-Leo (later renamed Dig-Dug-Leo). The Dugtrio heads are each called, Jessica (Japanese: ジェシカJessica), Ashley (Japanese: アシュリーAshley), and Michael (Japanese: マイケルMichael).
This AlolanDiglett appeared at Leo's after he and his Alolan Dugtrio performed a show on Melemele Island. This Diglett is a great fan of DJ Leo's Dugtrio, and became its apprentice after singing for it. It joined DJ Leo and the Dugtrio in the new group, named Dig-Dug-Leo.