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Lilia (Japanese: リリア Lilia) is a character of the day who appeared in A Keeper for Keeps?.
Lilia came across Ash and his friends while she was looking for her Buneary. After finding her Buneary and meeting Ash and company, Bonnie took it upon herself to propose that she marry her brother, Clemont. Unlike all of the other girls that Bonnie has asked the same question to, Lilia accepted Bonnie's proposal. Lilia agreed because she was the daughter of the president of a big robotics company called Orangics. She soon got to know Clemont and his passion for inventing and robotics; the two became quite friendly towards one another, much to Bonnie's dismay, because she was jealous of the attention that Clemont gave Lilia.
Lilia traveled with them for a short while and, as a result, encountered Team Rocket, who was trying to steal Buneary and Clemont's Bunnelby to increase Jessie's cuteness. After Team Rocket was defeated and the two Pokemon were returned, Lilia went back on her previous offer to travel with them to the next Pokémon Center, when she realized that choosing a partner isn't something that happens overnight, and that she'd like to travel and explore more of the world.
She reappeared in a flashback in Till We Compete Again!.
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This listing is of Lilia's known Pokémon in the anime: