I'm not going to participate in this tournament because i won't have the time but wouldnt scarf imprison smeargle be an option with Imprison/Dark Void/Entrainment/(tranform?)
TBH Not even sure I'd bother with Scarf Smeargle in this metagame. After the initial shock, people have adapted pretty well to Smeargle. Smeargle is no joke, but its certainly easier to deal with than it is in VGC thanks to Lum and Chesto Berries being easy to slap on several mons, and a lot of priority / fast Pokemon flying around at the moment.
Scarf in particular is really vulnerable to priority and lum berries, so I'd probably try something else if I wanted to screw with Smeargle, like Lum Hitmontop or Feint / Fake Out Pokemon like Weavile.