Double Battles shouldn't see the use of hazards, at least not a lot. Switching can cost you so much more in doubles, so it's really unusual to switch Pokemon. Most times you just have to let your Pokemon out on the field tough it out instead of switching, since that wastes you a precious move.
Smeargle will very likely be KO'd before doing anything, and with the popularity of moves like Fake Out and other priority moves like Mach Punch, Smeargle won't be long lived. Also, Prankster is really common in doubles, and when you see a Smeargle, you will immediately know that it's there to set up.
Smeargle is just not good for double battles, considering that they're hyper offensive, and your opponent can just target one Pokemon with both of its Pokemon to remove a threat. If you really wanted to use it, use something that has considerable bulk and Follow Me, like Togekiss or Jirachi. But like I said, switching is so much less common in doubles that you'd do more damage by outright attacking rather than waiting for your opponent to switch into residual hazard damage.
