Lets be honest, Hippopotas, the staple to Sandstorm teams, has means of offense whatsoever. So, I tried this.
Hippopotas @ Eviolite
Trait: Sand Stream
EVs: 252 HP / 4 Def / 252 SpD
Impish Nature (+Def, -SAtk)
- Stealth Rock
- Slack Off
- Rock Tomb
- Mud-Slap
This set has worked to great effect in UU, since almost all other Hippopotas sets are shut down by Taunt. Taunt + WoW Mew? No problem, lower its Speed, and then send in your CB Mamoswine (even though it might be gone soon :[ ). Deoxys-D giving you trouble? Lower its Speed so that slower sweepers such as Escavalier can match it. It can even handle Chansey (without Toxic), to some extent; Lower its Speed, get it to -6 Accuracy. Hippo can take 3 Seismic Tosses, so it isn't going down easily. From there, you can PP Stall it out, with Sandstorm and without Leftovers, Chansey won't stand long. You could use Tackle in place of SR to stall it out for 64 turns, but otherwise its a wasted moveslot. And again, not all Chanseys carry TW, so its best to scout for Toxic before you switch it in.
The aim of this set is to not become Taunt bait and support teammates, not to hit hard. Think Icy Wind Gengar last gen, for example. It lowered the foe's Speed to help it sweep itself (and to break Sashes, but that's beside the point). In this case, Hippopotas lowers the foe's Speed and/or Accuracy to support its teammates' sweep, instead of sweeping himself. It can also make the opponent switch and rack entry hazard damage, combined with Spikes support. Things like Crobat, Mew, and Victini would all hate to have their Speed lowered, and the Speed drop can really aid slow sweepers. Rhyperior set up a free Rock Polish when the opponent switches, fearing that they'll either be outsped or their moves will miss (think -2 Focus Blast on Cobalion).