I haven't put my hands on the game just yet, but looking at the region's dex; I'm starting to get a idea on my main 6.
The starter will be Mudkip instead of my original Torchic in Ruby since the disappointed I received back then with the final evolution, even though I loved Combusken. I genuinely had this silly theory it would evolve to Groudon... let's not speak about it ever again. Plus, I loved Swampert's design back then and of all the 3rd generation's starters, he was my favorite. However, I may drop the starter later if I find better alternatives.
In every new game I had a problem in picking up a great grass type that wasn't a starter. Now, I need someone who isn't as reliable as Bulbasaur, Turtwig, and Snivy. Glancing through the Pokedex, I noticed that Lotad & Oddish had great improvements in attacks and stats especially the latter. I'm leaning towards Oddish since the addition of Moonblast to its arsenal is quite interesting. Also, Vileplume got a boost in this generation, and I'm eager to try it out.
The shiny Beldum will be present since I was always interested in one since the original games came out. Notice that I left out the Mega part since I'm not a fan of that ridiculous design...
Unlike my Fairy experience with Sylveon in X, this time around I'm going to trust Ralts. Gardevoir would be a nice contrast to Wally's Gallade too.
Drought Vulpix is there for the fire spot, even though I really wanted GF to make a Mega Torkoal for a stall team I had in mind. Anyway, of all the little available fire types, she's a keeper.
Sableye could have a place in my team since I'm interested in his Mega Evolution.
So, the final team so far...
;260; ;045; ;302; ;038; ;282; ;376;
The post game team... now that's a different story.