godzillanon:

It’s a longshot, but I’m guessing that based on the Sun/Moon ED Ash will get Firium, Electrium, Ghostium, and Fightinium Z at some point during his time in Alola

Which then leads me to believe that he’ll end up catching that Litten, Rowlet will end up evolving into Decidueye at some point, and he’ll get a Fighting type.