I sat down with Nachos, and we went over each Garchomp set in detail.
The Swords Dance needs to be completely redone from the ground up. 10 Def IVs is terrible, terrible, terrible
on Garchomp. Getting the jump on Genesect is not worth sacrificing Garchomp's awesome physical bulk. I apologize for misleading everyone into thinking that lowering Garchomp's defenses was EVER a good idea.
name: Swords Dance
move 1: Swords Dance
move 2: Outrage / Dragon Claw
move 3: Earthquake
move 4: Fire Fang
item: Yache Berry / Haban Berry
ability: Rough Skin
evs: 4 HP / 252 Atk / 252 Spe
You'll notice that we added Haban Berry to the Swords Dance set. While it might not be of any use against LO/Specs Latios, Haban berry let's you somewhat bypass Latias and opposing Garchomp, Salamence (unboosted) and it'll definitely be relevant if Kyurem-B gets unbanned, since Garchomp can take Scarf outrages with a haban berry. We decided to split Swords Dance 2 different sets. We didn't like the idea of shoving multiple playstyles into a single set, so we decided to create a new set, SubSD.
name: Substitute + Swords Dance
move 1: Substitute
move 2: Swords Dance
move 3: Outrage / Dragon Claw
move 4: Earthquake
item: Leftovers / Salac Berry
They're similar sets, but this variant focuses on setting up Substitutes on switches and setting up on Pokemon that can't touch it (or just damaging fast checks like Latios) or abusing salac berry to sweep.
Stealth Rock + 3 Atks(set name: Stealth Rock)
Swords Dance should get an AC mention because after Garchomp lays down SR, it can also pull double duty and act as a Swords Dance user. It comes in handy when your opponent has something like Hippowdown or physically defensive Rotom-W / Jellicent. Remember though, it's too situational to get any mention outside of AC. Fire Fang should have priority over Fire Blast. Both moves are situational, but Fire Blast comes with lowered defenses, which might screw you over if your opponent isn't using Skarmory.
We didn't have enough time to go over the Support set, but it needs to be tested again. Nachos didn't feel think there would be a point to using it over the SR + 3 atks set that Alexwolf posted.
Fire Fang should be used when in Sun teams
Remove this. Fire Fang should be used on all teams outside of rain.
Choice Band > Swords Dance > Substitute + Swords Dance > Choice Scarf > Stealth Rock > Support`
The set order is subject to change, but for the most part it should look like this. Choice Band gets top spot because it's the most effective set Garchomp can run in BW OU2. Skarmory usage is at an all time low, and teams are relying on grounded steel-types to check Dragons. CB Garchomp unquestionable thrives in this metagame. The Swords Dance sets are next, and they're more or less on par with each other (they might switch positions). Scarf has definitely taken a hit in viability, but it's still decent in the current metagame. Being able to outspeed common scarfers like Salamence, Genesect and Thundurus-T is definitely a plus, and Garchomp can still sweep lategame if Steels are gone (that didn't stop being a thing). Stealth Rock & Support get the last 2 set slots, although Stealth Rock is liable to move up if it ends up being better than we initially anticipated.