Sure, Lillie becomes a trainer you can partner with at the Battle Tree in the post-game and she helps you out when battling Team Rainbow Rocket (more on this later), but those don't exactly sufficiently replace a scene that I felt was one of the defining moments of the original Sun and Moon. (attackofthefanboy.com)
It starts off with having to go to Festival Plaza and battling a Team Rainbow Rocket grunt at the Battle Agency, which was kind of annoying since, as I stated earlier, I like just being able to use my own Pokémon instead of borrowing other random ones, but it was only one battle, so it wasn't too bad. (attackofthefanboy.com)
Then they hit a rough patch before battling Team Evans to a 5 - 4 W and getting the maximum 15 points. (allsportsseries.com)