345ash-greninja
Auto-Memories Doll
Grubbin might actually be caught in this episode. It was caught in the opening with the classmates watching and it's confirmed he caught something in the forest. If Rowlet isn't confirmed to be caught in this episode then Ash failed to catch it this time. It would be hilarious if the episode ends with Ash trying to convince Rowlet to get in the ball but it ends up flying with Ash's watermelon!
The title of SM4 highly suggests that Rowlet will be his first capture in Alola, though.