The only one of Ashs pokemon I see evolve is Scraggy and Snivy. Scraggy could evolving while saving Axew and Snivy because I think they could do as they did in Johto. Stage one for the fire starter, stage one for the grass starter and water starter unevolved. Then I hope that Oshawott stays for training in that upcoming episode.
As for Iris Axew will not evolve in this saga. Maybe if she makes a comeback in later series.
Cilan should catch one more pokemon but I dont know which. Something that fits his personality.