Lillipup and Clefairy used to spend a lot of time with Lillie and her family. Lillipup appeared in a photo frame, in which Lillie, her mother Lusamine, and her brother, Gladion, were portrayed in. Lusamine kept pictures of her children and their Pokémon, including Lillie and Lillipup, in her office.
Lillie was working at the orchard with her family and the Pokémon, including Herdier, when she was young.
None of Herdier's moves are known.