Lillie works as Professor Kukui's assistant and seems to have a Cosmog.
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Lillie made her debut in the first episode of the Pokémon Sun and Moon anime, Alola to New Adventure!. She is a major character in the seasons based on Sun and Moon/Ultra Sun and Ultra Moon.
Lillie's debut outfit and hairstyle resemble Nihilego. This may have been a result of her mother's obsession with said Pokémon.
A small symbol, consisting of three ovals, appears on most of Lillie's clothing in her debut outfit. The symbol is absent from her "Z-powered" outfit. It also appears on Gladion's bag, foreshadowing their connection.