Okay, here I am. Interesting team you got there, but there's still room for improvement.
First of all, your Rotom is itemless at the moment. Please fix that, since it's quite hard to give a full rate without knowing if it's Scarf or Specs (I assume it's one of the two since it runs Trick).
Second. There are two main flaws behind the design of this team: lack of Stealth Rock and lack of a Spinner. You can't use TWO SR weak pokes like Volcarona and Dragonite without proper support, and not using hazards at all is just asking to be torn apart by all those Flying threats that infest BW2 meta right now (just to name a few, Thundurus-T, Tornadus-T, Dragonite). You could solve both problems with Donphan, as Alexander suggested, but I think
Forretress is more useful here (in place of Jelli). While it doesn't hit as hard as Donphan does, it's still a safe switch in for Scizor, and can take advantage of Rain to weaken its Fire weakness. Also, being able to Volt Switch means it's hardly a momentum killer, if you can predict decently. Donphan has indeed one advantage over Forretress, since it can cushion Stone Edges that are otherwise a huge problem for your team. However, Forretress can do it too, since Choice Band Terrakion's Stone Edge still requires hazards to 2HKO, and Forry OHKOs back easily with Gyro Ball. Forretress also gives you an additional Grass resist, which may be useful, while Donphan's typing will bring you another weakness, which can be dangerous.
Forretress

Forretress @ Leftovers | Sturdy
Relaxed | 252 HP / 4 Atk / 252 Def | 0 Spe IVs
- Stealth Rock
- Rapid Spin
- Gyro Ball
- Volt Switch / Pain Split
Third. Your team is weak to Tornadus-T at the moment. Offensive Rotom can switch in only once (if it's Specs) or twice (if it's Scarf and doesn't get confused), then Tornadus sweeps if it's not in KO range for Scizor. You also completely lack revenge killers that can outspeed him, which is quite a problem if it manages to catch Scizor with Hurricane on the switch, or if it goes down somewhat. I suggest switching to a
Choice Scarf Politoed, that can outspeed and OHKO all unboosted OU except from some very rare things (Accelgor, Jolteon, and Aerodactyl, if I'm not wrong). This will fix your lack of revenge killer somewhat. Also, using a
Specially Defensive Rotom-W gives you a safe switch-in to Tornadus-T, and allows you to spread burns more effectively, since you're not locked into WoW by the Choice item you're using. Rotom-W is very handy in today's metagame, checking perfectly opposing Rain teams and being an awesome specially bulky pivot in general.
Scarf Toed

Politoed @ Choice Scarf | Drizzle
Timid | 4 HP | 252 SpA | 252 Spe
- Hydro Pump / Surf
- Ice Beam
- Focus Blast
- HP Grass / Perish Song
SpD Rotom-W

Rotom-W @ Leftovers | Levitate
Calm | 252 HP / 32 SpA / 224 SpD
- Hydro Pump
- Volt Switch
- Pain Split
- Will-O-Wisp
Also, a little less important, but I don't like Dragon Claw on offensive DNite. Doing so makes you easily walled even at +1, and forced out in various ways. Protect Politoed is not even 2HKO'd by +1 Dragon Claw factoring in Lefties, not to even mention a random Steel type, that resists everything and can force you out easily. If you want to use Dragon Claw, the way to go is SubDD Dragonite in my opinion; it's much harder to force out thanks to Roost / Substitute and much better overall bulk; if you don't want to give up priority, though, I'd suggest a full attacking set with Lum Berry and Outrage.
SubDD Nite

Dragonite @ Leftovers | Multiscale
Jolly | 252 HP / 64 Def / 60 SpD / 132 Spe
- Substitute
- Roost
- Dragon Dance
- Dragon Claw
Hope it helped. Good luck for your team.