Alolan anomaly

(I obviously don't own pokemon. We would have the full pokedex in every game if I did.)
In Alola, a young boy lays sleeping in a den in Mount Lanakila. Raised with the wild pokemon of the mountain, the boy is blissfully unaware of the terrible atrocities that surround his origins. Taking trips and stealing berries and books from the general public, he learns how to speak with people and pokemon alike, confused as to why nobody but him can understand what they're saying.