well, they're not going to patch pokemon bank for Sun/Moon compatability until January, so... that should help your decision.
That being said, might I reccomend Wonder Trade or the GTS functions, which will return in the new Festival Plaza? Wonder Trade in particular spent most of the time during it's X/Y career flooded with the likes of Froakie, Fennekin, and Chespin from people breeding those pokemon.
Also, according to Ash Paulsen of Gamexplain, he got to play Pokemon Sun at a press event, and he got the Nintendo Rep to confirm to him that Poke'ride will be replacing HMs... especially given how seamless the implimentation is in the special demo, I have to say that this is VERY Exciting news.