People use Smeargle for Sticky Web setting? I always assumed good players used Shuckle given that it's far better than Galvantula for two reasons : it can afford to run Mental Herb over Focus Sash, which stops it from being Taunt bait for the likes of Thundurus and Sableye, and it has Encore, which is a very important move which stops it from being simple setup fodder, and can also lock the opponent into Taunt, giving a free switch into something offensive. Simply put, a suicide lead should always have a way to stop Pokemon from setting up over it, which is why Galvantula is just bad at its job.
I guess you can use Smeargle for SW, but the only set you should use on it is Sticky Web / Spore or Stealth Rocks / Taunt / Magic Coat with a Focus Sash. But I honestly prefer Shuckle for its ability to potentially set more than one Hazard. Smeargle can only set Webs and not Rocks, more often than not. And if you carry Spore to disable something on the opposing team, you have to give up Rocks, since both Taunt (to stop opponents form setting up) and Magic Coat (to stop faster Taunters) I still prefer Shuckle, given that it can do, or rather, take advantage of both these things at once.