Lillie

Lillie is Professor Kukuri's assistant and according to the Pokemon website she plays a big role in the story of Sun and Moon. I guess Lillie and her one Pokemon must play a big rule on the final island since, nothing has hinted at her being a key part to the plot yet. It also kind of sucks that she is not your main rival since, Hau is a bit of a pushover for the most part.

Oh, I'd say she's a HUGE part of the plot since I just finished beating Sun just yesterday. I thought the ending was sweet; though I don't really miss her leading me around every where as when the game first started. -_-