It takes way too long to get that set up, by which time:
-Smeargle will be taunted
-Shedinja will be burnt/ poisoned
-something will have used a ghost/fire/flying/dark/rock move on Shedinja
Or something like that. Doubles is so offensive that you don't really have time for setting up, unless it's Tailwind/ Trick Room. You're so much better off actually attacking than trying to make a mediocre Pokemon usable.