Yeah, BP teams are fairly viable. This is thanks in large part to Scolipede who isn't a pure support Pokemon like Ninjask since its base 100 Attack and STAB Megahorn allows it to utilize its own boosts if the situation calls for it.
As for Barbaracle, it's certainly viable. There aren't tons of things that can handle its boosted attacks, but the problem it has is what it's weak to. A weakness to Fighting sucks a ton when the top 2 megas (Heracross and Medicham) are part Fighting-type. A weakness to Volt Switch is unfortunate considering there are plenty users of the move here. Mega Manectric, Thundurus-T, and Jolteon just to name a few. When I see it, I just try to keep up offensive pressure and preserve my Scarf user just in case if the team I'm using has one.
That said, there are a couple of things I've been using recently that I've grown quite fond of (on different teams) One should come as no surprise considering how strong it is, but the other will only come as no surprise for those few people who knew me back in BW1:
Gardevoir (F) @ Gardevoirite
Trait: Pixilate (Trace)
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Hyper Voice
- Psyshock
- Focus Blast / Thunderbolt
- Substitute / Calm Mind / Shadow Ball
Mega Gardevoir is really damn strong. Fairy is basically the new Dragon. No immunities, only 3 resistances based on type. Easy offensive type to spam. Psyshock beats down special walls like Chansey and Snorlax while also discouraging Poison-types from coming in. One of two moves has to be used in the 3rd slot to pick off Empoleon, arguably the most durable check to Gardevoir. I pick Focus Blast since it also hits every other Steel-type in the tier bar Metagross for super effective damage. Of course, Thunderbolt is safer against Empoleon, but then you can't hit most other Steels for super effective damage. The last slot is really flexible. I personally use Sub so I can block Sucker Punch and guard against Focus Blast doing what it does best; missing. This also lets Gardevoir sweep if there aren't more than 2 Pokemon that can outspeed and break her Sub. If you still want to go the sweeping route, Calm Mind is an option to just send Gardevoir's damage output through the roof. But then you're flattened by any Sucker Punch or Bullet Punch user out there. You can also go for full coverage in Shadow Ball. This lets Gardevoir hit the only common Steel-type that is able to avoid super effective damage from Focus Blast; Metagross. Going this route allows Gardevoir to be more of a wallbreaker rather than a sweeper. There's also a couple of other niche options if your team needs them. Will-O-Wisp can cripple any physical attacker (bar Fire-types) that tries to come in on Gardevoir. Taunt stops Empoleon from supporting its team with Rocks or Defog which can give a teammate a very easy switch-in. Destiny Bond can take down a dangerous threat with Gardevoir so long as she outspeeds them. Also nice for discouraging the use of Sucker Punch or Bullet Punch on Gardevoir.
Staraptor (M) @ Choice Scarf
Trait: Reckless
EVs: 252 Atk / 4 Def / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Brave Bird
- Close Combat
- Double-Edge / Return
- U-turn
Ok, I"ve loved this guy ever since BW1, but the changes that happened with BW2 were really unkind to it. However, in XY UU (Beta) Scarf Raptor is amazing. Base 100 Speed is great right now since it beats out Haxorus and Zygarde, the most common DD users in the tier. There's also the fact that Brave Bird will slice straight through the 3 top megas right now (Heracross, Medicham, and Gardevoir) Next up is Close Combat. Pretty simple as to what this does. You can lure out Steel- and Rock-types and proceed to smash them with Close Combat. Double-Edge is another high powered STAB move that rips through bulkier Electric-types such as Zapdos and Rotom-H like it was nothing. It also is a clear 2HKO on Mega Manectric factoring in the Intimidate drop. Return is a bit safer and will still 2HKO offensive variants of Zapdos and Rotom-H, but bulkier variants can still take it if SR isn't up on the field. U-turn rounds out the set and allows Staraptor to be a decent lead option that can put immediate pressure on the opposing team from the start. This set can be run as the same except with a Choice Band instead of a Choice Scarf so you can just bulldoze through shit. Just know that you'll only have a 50/50 shot at beating Mega Medicham and Mega Gardevoir since they both sit at base 100 as well. I personally like this as a Choice Scarf set more since it's really great knowing that as long as I keep Staraptor alive, Mega Medicham and Mega Gardevoir can't sweep through my team.