This is what I've been using to moderate success so far... (edits = bold)
Talonflame @ Sharp Beak
Gale Wings
Adamant 252 Atk / 252 Spe / 4 HP
Brave Bird
Flare Blitz
U-Turn
Sleep Talk / Tail Wind / Will-o-Wisp / Roost
Decided to ditch Choice Band since I already have something else with a Choice item, and I'd rather not have potentially 2 Pokemon getting locked into a move in 3v3. Talonflame is pretty much easy-mode against less skilled players, but most other people seem prepared enough... Still does a pretty good job. Rarely end up using the 4th move, so I just cycle through random moves but I think Sleep Talk is the best utility.
Edit: Might try Scizor here instead to get the jump on some fairies, but the most common ones I've encountered [since first posting this] are Mawile and Azumarill which I've got decent checks for already.
Garchomp @ Rocky Helmet / Life Orb
Rough Skin
Naive 252 Atk / 252 Spe / 4 HP
Dragon Claw / Swords Dance
Earthquake
Outrage
Substitute
awesome. usually ends up winning the game for me, or at least getting some important kills. Garchomp has such a troll-y speed I love it. Went Naive since I was originally running FBlast for Scizor. I was using Sand Veil w/ Focus Sash at first since I paired him with TTar often. Was ~okay~, Sand Veil barely ever activated anyway so now I'm just going for ++chip damage with r.skin+r.helmet, but I might go back to sash or try lum for some different utility. Iron Head was OK sometimes to nail fairies trying to come in on an expect dragon-move, but I found I'd rather just go EQ to hit switch-ins. Want to try Substitute, I think it could offer some great utility, paired with Life Orb or try a sub-swords dance set
Edit: Substitute has been pretty helpful
Tyranitar @ Tyranitarite
Sand Stream
Jolly 252 Atk / 252 Spe / 4 HP
Rock Slide
Crunch
Earthquake
Dragon Dance
Also wrecks. I think a lot of people misjudge TTar's bulk, which lets me get off a DD and +1/+1 MegaTar is really dangerous. Rock Slide >>> Stone Edge because missing really, really sucks and its really not worth the extra power... I'd rather gamble on getting a flinch with R-Slide, and usually just go with Crunch anyway, defense drops are fun. Usually paired with Chomp, where 1 will open a hole in the team while the other finishes it off.
Rotom-W @ Sitrus Berry
Levitate
Bold 252 HP / lots of defense / some speed (can't remember exact #s, prob just the standard EV spread from the smogon dex)
Hydro Pump
Thunderbolt
Will-O-Wisp
Toxic --> Volt Switch
no Volt Switch because I can't afford it from the Battle Maison yet lolz. Sucks not having it, but Rotom is so good and is so helpful. Neuters physical sweepers, shits on Gliscor. He usually ends up switching in a lot, I wish Pain Split was available in XY (fingers crossed for tutors in ORAS!!) since Rotom really wants recovery. Sitrus is manageable, might try ChestoResto. Really can't explain how many times Rotom has saved my butt or created a small crack in my opponents team for someone like Chomp/TTar to tear open.
Edit: Toxic is better filler than Confuse Ray. Might even try Hex.
Hydreigon @ Choice Scarf
Levitate
Timid 252 SpA / 252 Spe / 4 SpD (or HP? or Atk?)
Draco Meteor
Dragon Pulse / U-Turn
Dark Pulse
Flamethrower / Fire Blast / U-Turn
I bred Timid instead of Modest for some reason. I sometimes wish she had some extra kick, I need to see if max speed w/ CS outspeeds anything worthwhile anyway. Pretty fantastic. usually just Draco Meteors the shit out of everything, revenge kills other dragons, was running Fire Blast to check Mawile but I might try out U-Turn so she can function better as a pivot/lead. handles Gengar if I didn't bring TTar to the battle. not the most important member, but I like her. hate getting locked into 1 move though.
Edit: Got the Flamethrower TM which I'm using over Fire Blast since it's a OHKO against Mawile always, but loses out on reliably OHKO Ferrothorn for max health. Might swap Dragon Pulse with U-Turn instead as having that fire move has been very valuable.
Charizard @ Charizardite X
Blaze / Tough Claws
Adamant bulky-ish spread with max attack
Dragon Claw
Flare Blitz
Outrage / Roost
Dragon Dance
I've only used this once and it died almost instantly (a combination of SR and Calm Mind Raikou...) sooo... on paper it looks good! don't know what to do with the 3rd slot. Outrage is only there bc it was an egg move, might try Roost instead (if I ever get around to bringing this to a battle). It's a gamble between this and Talonflame to swap out with Scizor. when I was breeding I didn't even think about the fact I bred 3 sweepers weak to Fairy but I haven't had trouble with them.....yet
Super cookie cutter I know but this is my first team so I just wanted to get a feel for the real Battle Spot (instead of Showdown Battle Spot) and when I first started breeding I wanted to get a bunch of reliable staples before moving onto more quirky stuff. Want to try Aegislash, Heracross, Scizor, Pinsir, and Reuniclus because I'm scared of Breloom and I've wanted to use it.