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I dont think Ash will have travel companions this time, atleast in the usual way
It seems like this season will be more like a school anime, so they'll have a large cast with the trail captians and maybe some other school kids
Maybe when Ash does venture out to do the trails, The captians will go with him and they'll rotate of per trial, with an extra tagging along
It could be a good reason to bring back Serena, Brock, May, Gary, Dawn, etc. and have them be on vacation or research trips in Alola and accompany Ash for one trial each