During a nice walk through the streets at... night. Yes, it's weird, dangerous, but the breeze is good, so, who cares? ;)

While taking a nice, cool breeze, you saw, in an abandoned building, something moving... It disappeared though... Huh...

Soon, the Pokémon jumpscares you and makes a laugh-like cry... Oh, it's an Alolan Riolu! Those are known to be pranksters...

"Ri! Ri! Ri! Oluuuu!!"