Luxray
Quiet/Brave
204 HP / 54 ATK / 252 sATK
@Leftovers
-Hidden Power Fighting/Ground
-Crunch
-Thunderwave
-Lightscreen
I've been playing with this and having quite a lot of success with it on shoddy as a lead on a very offensive team. Intimidate makes this pretty bulky in UU, being able to stand up to most offensive threats. You guys all know the magic of intimidate though, and it'll work for Luxray in UU as much as it does for Gyara in OU.
The value of an ability that nets you some advantage before the battle's even started cannot be underestimated. Lead v. Lead is a point in time when it truly comes down to rock-paper-scissors, and either side could draw bad and be forced to flee. At that point in time you'll be much better off if your ability has already done something for you.
Essentially, this Luxray works very much like Gyarados-- intimidate and powerful disabling support moves it is capable of recking defensive threats, who will be panickedly switched in at the threat of attacks off of 120 base ATK and 95 sp.ATK. People generally don't think of Luxray as a fearsome sweeper due to thunderfang's low base power and a lack of speed, but when you're an intimidated scyther Luxray seems a lot more fearsome.
Speaking of threat, I find that the threat of electric attacks is actually more fearsome than the electric moves themselves. Thunderbolt/Thunderfang are huge threats to all the many competitive water and flying types running around UU. Especially the flying types who generally are physically offensive (I'm looking at you scyther and swellow). Intimidate and the scare of electric attacks generally leads to one conclusion: I'm switching.
Here's where it gets interesting. The threat of electric attacks generally pulls out ground types. The thing about ground types is that the number 1 likely poke to be switched in here, steelix, is 2 HKO'd by a super effective hidden power. This is including all those sp.DEF evs the standard set carries. In addition, Luxray is NOT 1hko'd by steelix' earthquake even WITHOUT intimidate. So luxray will always beat steelix if it HPs on the switch. The other thing about this situation, is its so damn obvious what's coming-- a STAB earthquake. Now's a great chance to bring in your own flyer/levitator-- rotom, swellow, scyther, etc, depending on the situation. There's nothing these types of frail yet powerful sweepers like more than free switch ins, and in the early turn you can play even more mind games by combining this Luxray with U-Turn Flying Sweepers. >:D
Luxray is a switch whore. It wants to switch in, and thus it doesn't mind switching out. It wants to abuse intimidate and force situations where the opponet is forced to make iffy decisions. Thunderwave and Light Screen work beautifully in concert with this mind set of "Come in, screw the opponent up, then get my ass out." The way I play this poke, is I worry very little about its health or losing it. Its my intimidate bitch. I have it t-wave its ass off, attacking where possible from 289/316 offensive stats, and when it's about dead I'll even switch it INTO an incoming earthquake if it means leaving the opponent screwed by 1 more intimidate (I've actually had it do this and live a couple of times too). In other words, this is my go-to pokemon for any unsure switch. Essentially, this guy forces switches, which is something that works beautifully when all his teammates are offensive threats.
As a last word, I'll talk about crunch. It seems like an odd choice, but not really considering its coverage with hidden power fighting and the fact that it shaves off huge chunks from all the psychic type walls. Combined with light screen, it also lets Luxray stay in against opponents like rotom, jynx (if you have another poke asleep) and froslass, making him a threat to special attackers as well as physical attackers. In any case, they all hate thunderwave. Alternatively, Ice Fang could be used here though for added freeze hax or para-flinch-hax. If you do, I'd say go with Hidden Power Ground for coverage.
About nature: Just like with Bulky Gyara, its true that Luxray will get more overall from +ATK nature. You should try not to be tempted by this. Quiet is necessary to secure the 2hko on steelix. You got no chance with brave. On the other hand, with Quiet, you pretty much have no chance of 2HKOing hypno with crunch. IMO, Steelix is more important, as its like the physcial blissy of UU, and it will be switching in against you more times than hypno. Besides, despite the fact that Luxray is slow and has lightscreen, fighting against hypno and its thunderwave is not what it does best. Where possible, stick to switching in against physical attackers and screwing them with intimidate.
Overall, I've had a lot of success with this guy so I'd say give him a shot.