Oh hey I haven't seen you in a while. She's certainly brimming with optimism and positive energy, which might be considered refreshing compared to other Chikorita characters outside of Chicolita. Perhaps because this is one case of the game writing the character for me?
Here's some useless trivia. Did you know that, if we're not counting Diary of a Gamer Girl, there's at least one Chikorita in each series? This is being generous and including Happa the slime-Chikorita from Chibi's Corner. Even Vulpix doesn't have this track record and I like Vulpix way more.
Lilia hails from Carmela: ¡Alcance las Estrellas! and is inspired by the Chikorita of the same name from my copy of Pokemon Mystery Dungeon: Blue Rescue Team.