I have a friend who runs Sash Mence but he won't listen when I say its bad...
TBH, if ur going to run DD Mence you kinda have to run Intimidate as Mence simply lacks the bulk to reliably set up DDs, and Sash sets just fall to the same problems as DDnite. If you REALLY want to use Mence for DD (here's a tip: don't) you should only really use the Sub DD set:
Salamence @ Lum Berry
Ability: Intimidate
EVs: 96 HP / 252 Atk / 160 Spe
Jolly Nature
- Dragon Dance
- Substitute
- Dragon Claw
- Roost / Fire Blast / Iron Tail
The EVs outpace Jolly Excadrill before a boost (and Jolly ScarfDrill after one), and the 4th move comes down to what your team needs. Generally Roost is best, but if you lack Magnezone support, run Fire Blast and if you lack a reliable way of beating Fairies, run Iron Tail. Lum Berry stops fast 'Wisp users (e.g. Talonflame) from burning you or Thundurus from paralyzing you before you can get up a sub.
This is the only DD-Mence set which it isn't outclassed by Dnite and Char-X, but even then I don't recommend running it. The reason that you would use this over Dragonite is because it can use Sub without sacrificing Multiscale, and the reason that you'd use it over Char-X is because Intimidate makes it easier to set up Substitutes.
But for god sake: don't use this. There is literally zero reason to run Mence if you aren't giving it a Choice Scarf, as even WITH this set it is still outclassed by Dragonite and CharX. The most useful thing that Mence outclasses as a DD user in OU is Scrafty (which says a lot on its own), but even then it only outclasses Intimidate DD Scrafty (because Scrafty gets Shed Skin, meaning it can't be reliably burned and that it doesn't need to sacrifice its item slot to Lum Berry), which really shows how mediocre Mence is as a DD user.