In keeping with my fetish for Choice Band/Specs, I actually feel that should Techniloom ever be released a CB set would have a ton of merit. I would use:
Breloom @ Choice Band
Ability: Technician
EVs: 4HP/252Atk/252Spe
Nature: Adamant
~ Mach Punch
~ Bullet Seed
~ Low Sweep
~ Stone Edge
Everything here whores Technician but the worst move in the game, which I guess is required for Dragonite and Salamence. With Jolly, Breloom would be able to tie beneficial speed nature 130 Base Speed pokemon that would switch into LS, but that distinction is reserved for exactly Crobat which would have a 50/50 shot of OHKOing Loom anyway. More important are the pokes between 115-130 base speed that would even dare switch into Breloom, and that is pretty much only Starmie, which would be 240 speed (if Timid and 252 Spe EVs) to Adamant Breloom's 239. One pokemon isn't enough to forgo the 10% boost to Attack afforded by Adamant, especially for the weird scarf stuff that doesn't deserve my attention that would have any chance of falling in between 240 and 262 speed after switching into exactly one move in LS. Adamant also allows Breloom to do more with BS to Chandelure, which is enough of a little bitch without its DW ability.
Force Palm is an option over Low Sweep if you would rather attempt to spread paralysis and have a 30% chance of accomplishing the same thing over two turns as you would with LS against most pokemon (those slower than 115+ Base Speed max pokes accounting for scarves) and make it potentially easier for Breloom or a teammate to sweep later, but Low Sweep is just that good.
Here is the fun part: damage calculations! Bullet Seed hits for a little over three hits and 172 Power on average with rounding (three hits would be 165) so I'll use three hits for the Bulled Seed calcs. For some numbers:
252 Adamant Choice Band Technician Breloom -1 Atk Low Sweep
vs. Adamant min/min Salamence : 29.3% - 34.4%
Two hits and you have 69% even after Intim—if SR is up (as it should be when using a pokemon whose STAB is resisted by fliers), Salamence will fall with basically any other prior damage.
252 Adamant Choice Band Technician Breloom -1 Atk Stone Edge
vs. Adamant min/min Salamence : 87% - 102.7%
Always dying if SR is up.
252 Adamant Choice Band Technician Breloom Stone Edge
vs. Timid min/min Chandelure : 150.2% - 177%
252 Adamant Choice Band Technician Breloom Bullet Seed (3 hits)
vs. Timid min/min Chandelure : 62.1% - 74.7%
Doesn't quite notch the OHKO on average with SR up, but it's still very comforting to know that that Chandelure can't safely switch into half the moves of a pokemon it hard counters on paper via type (nothing counters Breloom though cause it's uber).
252 Adamant Choice Band Technician Breloom Mach Punch
vs. Adamant max/min Scizor : 47.1% - 55.8%
252 Adamant Choice Band Technician Breloom Low Sweep
vs. Adamant min/min Scizor : 86.1% - 101.8%
Pretty much can't switch into TeCBreloom (awful lol) at all and even threaten Bullet Punch unless Loom uses Bullet Seed.
252 Adamant Choice Band Technician Breloom Low Sweep
vs. Careful max/min Vespiquen: 23.3% - 27.3%
Even with SR up you may not be able to get Vespiquen, but that's what Stone Edge is for:
252 Adamant Choice Band Technician Breloom Stone Edge
vs. Careful max/min Vespiquen: 410.5% - 483.7%
252 Adamant Choice Band Technician Breloom Low Sweep
vs. Timid min/min Latios : 48.2% - 56.8%
252 Adamant Choice Band Technician Breloom Bullet Seed (3 hits)
vs. Timid min/min Latios : 59.8% - 70.8%
Low Sweep is a move. Latios is a pokemon. Breloom is also a pokemon, one that beats Latios with Low Sweep. Watch out for scarf obviously, though 2 Mach Punches will do 64-76%.
252 Adamant Choice Band Technician Breloom Bullet Seed (3 hits)
vs. Timid min/min Thundurus/Tornadus : 67.2% - 79.3%
With SR this has a shot to KO.
252 Adamant Choice Band Technician Breloom Low Sweep
vs. Timid min/min Thundurus/Tornadus : 54.2% - 63.9%
Always "OHKOed" by two LSes.
252 Adamant Choice Band Technician Breloom Low Sweep
vs. Timid min/min Volcarona : 55.3% - 65.3%
Doesn't even need SR support to kill every time with 2 LSes.
252 Adamant Choice Band Technician Breloom Bullet Seed (3 hits)
vs. Impish max/max Gliscor : 51.7% - 61.9%
No. Gliscor is also 226 speed to Breloom 239. Breloom has to do min damage like three turns in a row against Gliscor for it to be able to outstall the Bullet Seed damage with Poison Heal, but good luck with that. I'm sure some metagaming goes on with speed EVs and defensive EVs since Gliscor is a solid Breloom check with Poison Heal activated, so I won't bother calcing anything else here besides the 21-25% that Breloom does to this same Gliscor with Low Sweep.
252 Adamant Choice Band Technician Breloom Low Sweep
vs. Timid min/min Starmie : 52.9% - 62.5%
Jolly would 2HKO pretty much every time (and outspeed Starmie after the first hit which is the point) doing 48-57% but have fun switching a water type into a grass type that would otherwise put you to sleep or do like 500% with bullet seed (264-312% on average with BS but who's counting [i guess i am]).
252 Adamant Choice Band Technician Breloom Bullet Seed (3 hits)
vs. Timid min/min Gengar : 86.2% - 102.3%
252 Adamant Choice Band Technician Breloom Stone Edge
vs. Timid min/min Gengar : 104.2% - 122.6%
You don't scare Breloom, Gengar.
You get the drift. Breloom is uber. Basically, the only things in the top 10 from June Stats that can switch into Breloom at all are Gliscor kind of and Dragonite. Expand to top 25 and you have Skarmory, further to the rest of OU and it's pretty much only Forretress and Celebi. Drain Punch is an option over Stone Edge (and a good one, because fuck Stone Edge) to keep Breloom healthy for hit and runs. So assuming Nintendo isn't unreasonable (lol, good luck with that) and releases DW Shroomish as a female which would allow for egg move Bullet Seed, CB Techniloom would pose a different but formidable threat to the metagame. It's not unreasonable to feel that this would be released before ST Chandy is, and we'd probably just ban that anyway (because seriously Gamefreak?).