Went with Popplio myself. Its final form is alright. I'd have gone with Rowlet, for balance (Both ATK and S.ATK are pretty even), except near as I can tell it doesn't learn much in the way of special attacks I think.
My Popplio is male....I'm going to be confused when it evolves into a Primarina eventually. That's a very feminine looking pokemon, so I'm going to default to thinking of the pokemon as female.
Oddly enough, according to Serebii, it's overwhelmingly a male species. I did manage to get at least one female to spawn, but after several restarts I settled on a neutral nature one that had decent IVs (31 DEF, low ATK which doesn't matter much as it's primarly a S.ATK pokemon, and moderately high to high remaining stats).
Super Training is gone, which sucks. I'm not big on traditional EV training, never bothered with it. There are other ways of boosting it, but Super Training was really straightforward and easy to do. I'll miss having that. I'll probably just not pay attention to EVs in this game.
Also, Pokemon Bank for Sun and Moon will be coming in January it seems. I might actually use it, to transfer my faves from Alpha Sapphire. Presuming they can transfer over anyway. Garchomp, Milotic, and Gardevoir are my three faves from AS.