Speaking of new discoveries, if you have easy access to a regional pokemon from previous games "like a sand rush sandshrew or a drought vulpix, transferring them over to sun and moon and breeding them with a pokemon originating in alola WILL make the sandshrew/ vulpix, pass down their hidden ability into the now alola form offspring… “bred a sand rush sandslash and eventually got a jolly natured alright iv alolan sandshrew WITH slush rush… discovered this while I was trying to get a regular grimer via muk I got from unova (who had hidden ability) and was screwing up getting said offspring”.