Okay, I've been playing around with Alakazam a little and I have to say/hype on thing:
Leading with Alakazam is amazing.
The set is Psychic/Shadow Ball/Focus Blast with Life Orb and Substitute as the fourth move. Most people lead with a hazard Pokemon like Roserade or a weather mon like Abomasnow or something, and most Pokemon like that Alakazam will OHKO. Since Zam outright OHKOs so many Pokemon and because the opponent will want to put their momentum grabber first, leading with Alakazam immediately puts the opponent up a creek without a paddle. If you have the lead advantage, immediately use Substitute. The opponent will probably switch to a resist, but since Zam has amaxing three-move coverage, you'll probably 2KO. At this point, the opponent will not be able to defeat Alakazam without losing one Pokemon. Once you claim your sacrifice do not get rid of ALakazam unless it's to a Pursuiter (because you have to).
Alakazam can sweep both early game and late game in the same battle because it can't be "worn down" like a traditional sweeper. Even at 14% or so after taking a hit Alakazam is still fit to sweep because the opponent will either have to survive a 369 Special Attack Life Orb boosted attack and hit back, or have more than 372 Speed. Not many Pokemon at the end of the game can do either of those, so feel free to Alakarape them.
Notes:
1. If the opponent has a Krookodile, don't lead with Alakazam unless it's the only thing that can beat your opponent's most probable lead
2. People love leading with Deoxys-D and spending the first turn Stealth Rocking. Punish them with a Substitute and Shadow Ball 2KO.
3. Don't use Focus Sash on Alakazam. You miss out on a lot without Life Orb
4. Don't use Grass Knot. Sub+3 attacks all the way.
5. Get good at predicting leads. If the opponent has a fast Pursuiter they will probably save it to revenge Alakazam. Try to maintain a Substitute if you can.
on Stoutland
I use Stoutland on my main team and I think I can say with a little knowledge that it's not broken. It cannot break Rock types and some Steel types. It needs a lot of support to beat its counters, and if you can sweep with Stoutland then it's probably because you simply outplayed your opponent. It cannot break Rhyperior, Empoleon, and has a hard time with Registeel. The LO set is sorely lacking in power, while the CB set leaves you open to be set up on (though that's not a huge problem). It's a little like Excadrill in OU in that it's going to outspeed everything, but not nearly as powerful as Excadrill in OU and has a pretty crappy single STAB.
I don't want to sound like I'm saying Stoutland is bad, as it's a wonderful Pokemon because it outspeeds just about everything at +1 and still a lot of things at +2; however, you're not going to sweep with it unless you can do something about its counters. It needs to be carefully played around to beat, though. LO Stoutland doesn't OHKO a lot of things and can be worn down easily, while CB Stoutland OHKOs a lot more but is potentially setup bait after one kill. Normal STAB isn't great in a tier with so many Ghosts, Rocks, and Steels. Just pack a Spiritomb, Sableye, or Rhyperior and you won't have a lot of trouble with Stoutland as long as you keep them above 50%.
I think this Senate will need to vote on Hippowdon. It's just such a good Pokemon. Other than that, I don't think there are really any suspects besides Hippowdon and maybe Alakazam.