Clefable while it was a Cleffa, was originally owned by Lillie before her Alolan Vulpix Snowy and its first appearance was in a photo frame between herself, her mother Lusamine, and her brother, Gladion in which he happily befriended it. As they finally grew up, it evolved into a Clefairy.
Lillie revealed that Cleffa, who had evolved into a Clefairy, was her very first Pokémon. But due to her mother Lusamine's actions, she allowed Clefairy to evolve into a Clefable by touching the Moon Stone. Since evolving, both Lillie and Lusamine had a fell out for the incident and Lusamine owned Clefable.
None of Clefable's moves are known.