Just finished another playthrough, my thoughts/team.
The movesets I listed aren't really what my final movesets turned out to be, but they're what I think works the best.
Emboar (Flamethrower, Return, Arm Thrust, Level Ground/Head Smash)
I'm not sure if it's just me, but he didn't really live up to expectations. Arm Thrust was pretty much his only Fighting move the whole game, and Nitro Charge slowly got weaker as the game with on. That said, he sure as hell isn't BAD, just...not amazing.
Mid-High Tier
Swoobat (Psychic, Air Slash, Return, Fly/Assurance)
Honestly, I'm not sure why I even used it. Probably my friend being all OH MY GOD WOOBAT IS THE BEST THING EVAR, but meh. This thing has probably the worst defense out of everything you could use ingame. From me catching it in the Underground Waterway to the Elite Four, EVERYTHING killed it in one hit. Everything. That said, Air Slash was pretty amazing for flinchhaxing things to death, and Psychic is stronger then I expected.
Low Tier
Zebstrika (Return, Discharge, Nitro Charge, Thunder Wave)
Like Swoobat, it died way too much to be useful against the harder bosses. Unlike Swoobat, it was pretty good for Thunderwaving things, and Return + Nitro Charge was at least decent. The biggest problem is that it's a physical attacker in a game full of high-Defense Pokemon; when I replaced Discharge with Wild Volt, it's usefulness dropped like a rock.
Mid Tier
Excadrill (Earthquake, X-Scissor, Rock Slide, Return)
It's Excadrill.
High Tier
Sawsbuck (Return, Wood Horn, Jump Kick, Leech Seed)
What makes Sawsbuck so great is that as soon as you catch it, it's already a powerhouse. Jump Kick destroys things, Return gets STAB and wrecks EVERYTHING once you have Happiness up, and Wood Horn + Leech Seed gives it surprisingly good survivability. That said, dying to Fighting, Bug, Fire and Ice attacks can be a pain.
High Tier
Beartic (Icicle Drop, Surf, Aerial Ace, Return)
It gets NOTHING. Ice typing and low Defence makes it die to everything. Icicle Drop is more or less it's only great move, since Sigylph, Excadrill, even Swoobat and Unfezant can use Aerial Ace/Flying attacks more effectively. Surf runs off a terrible SpAtk. As if that wasn't bad enough, Icicle Drop has a terrible tendency to miss half the time. You'd think he'd be great for the eighth gym, but he can't even take on dragons without getting his ass handed to him.
Low Tier