>>35947624SM060 developed her as a trainer and Snowy also learned more moves.
SM080 is another episode for Lillie's development as a trainer.
She's the main girl of this series. There's a reason why she's the one who gets marketed alongside Ash as one of the show's main characters and why she's the one getting a book about her instead of any of the others. It's because she's the most important character.