We should share our discoveries about the new pokemon just like neotemplar.
Let's see... Aegislash, which another Bay12 kindly introduced, is incredible. He can transform between a tank and a damage dealer for free every time he takes an action. Not to mention he has an unbelievable protect skill called King's Shield. He's pretty freaking insane. Also ghost + steel, what the hell is that. I believe his only weakness is dark and ghost.
Azumarril has been pretty incredible for me. She gets this ability that just straight up boosts all her damage by 2x. Combined with how much hp she has (the HP training bag is literally an Azumarril), it's pretty crazy. Water + fairy is a damn good type too, giving her lots of amazing damage skills as well as being very strong defensively.
Goodra I still have no idea about. It's so weird. It's like some kind of support pokemon that's still relatively fragile. It's very flexible and can use almost any skill you need, but it doesn't help that it's sort of a jack of all trades, subpar in all kinda character.
Noivern is pretty strong too. I've only ever had to fight one and it wiped the floor with me with its draco meteor. Extremely high speed but I'm not sure exactly how high it is. It may or may not be as fast as Mewtwo. The rest of its stats seem kinda lame though in comparison. As far as I'm concerned, it seems to be designed specifically to kill other dragons as its faster than all of them by far and its a dragon itself, so it can just STAB them all.
Aurorus I'd put with Goodra. No idea what to do with him. Rock + Ice what the heck is that. It's not fast enough to do the job of ice beam properly either and its HP won't save it from being instagibbed. Like I said, no idea what to do with him. His ability is also weird, as the only special attack normal move I know is hyper beam. Maybe we can build him around that or something.
Aegislash is also weak to Fire and Ground, courtesy of Steel. That's one major crimper, as well as its predictability - if they swap forms every turn, you can use every other turn to set up. Also, Phantom Force - fun Ghost move, breaks through Protect effects like they don't even exist. Still, devastatingly good, since I can't exactly see two-turn moves like Phantom Force becoming a major force in the meta.
Gardevoir got a fair boost this gen. She no longer has her Dark weakness, with Fairy moves to retaliate in kind. She's weak to Poison, but her Psychic typing and speed lets her handle most challengers. She also gets a Mega Evolution, which is quite useful.
Clawitzer is quite tough, with a fun moveset and an ability to match (Mega Launcher boosts Pulse and Aura moves; and Clawitzer gets Water Pulse, Dark Pulse, Dragon Pulse, and Aura Sphere - hello, Choice set). It's a little tanky, too, capable of taking hits. Its major let-down is its low speed, but in Trick Room teams, this Pokemon will likely shine.
Noivern is basically a Special Crobat, only slower; it's between Darkrai and Dugtrio in speed. That's still more than enough to put it in the top 20, though. I never ran into a tough one (the only one I saw in link battles kept using Air Slash on Aegislash, which doesn't work well), but it sounds interesting.
Pangoro is fun. Mold Breaker is likely to be superior to Iron Fist, since I haven't seen that many punching moves to boost for her, and a lot of Pokemon are severely impaired by losing their Ability. Again, low speed, on par with Clawitzer, and relatively tanky. Great against Dark types, but those typically don't need much checking right now. Weakness to Fighting and Fairy hurts a bit, though. This one's another one for Trick Room, especially with Hammer Arm being available to lower its speed further.
Malamar, I haven't tried due to running Pangoro, Delphox, and Gardevoir, but it sounds like it'll be a lot of fun - either run Contrary Superpower or Topsy-Turvy set-up counter, and your opponent won't know which to expect until it comes in. This will drive Aegislash crazy, most likely; Contrary variants can pick up free boosts from King's Shield, Topsy-Turvy variants will turn Swords Dance into a self-inflicted debuff, and with its dual typing negating its weaknesses, it only takes ordinary damage from Sacred Sword or Shadow Claw/Sneak. On the down side, those Bug and Fairy weaknesses are going to smart.