Akala Island, Route 8.

After becoming the first ever champion of Alola, you decided... to kick back! You achieved one of the highest honors a Pokémon Trainer could be awarded! Ever!! And that rules! You were on Akala Island catching some Pokémon for the Pokédex, when your name was called from the roadisde motel on your right. Curious, you follow the voice and enter the hotel room door. There you meet a woman with lilac hair wearing all black. She even had some sort of communication device in her ear... what was her deal?

"It is an honor to meet you, of course, the first Champion of Alola. Please forgive our rude summons. My name is Anabel. I am the head of a secret division within the International Police. We are the UB Task Force."