Hi I feel like taking a break from work to post. I haven't done 500+ battles with Drapion yet, but I'm pretty sure I have done 500+ battles with Memento Uxie/Whimisicott by now, and I too have never seen the opponent switch "randomly". From what I gather, I can only make the guess that Zacchaeus is using Trick Scarf and then Memento. If opponent is tricked into a non-attacking move, it WILL switch eventually, not necessarily the turn after, so I am guessing that opponent switched after memento has occurred because it was locked into a non-damaging move. So, should never ever memento if opponent has been accidentally or intentionally tricked into a non-damaging move, until after the opponent actually switches. I don't really want to comment too much, but I think (and of course feel free to correct if I'm wrong, since it's just what I was thinking) the main problem was that Zacchaeus wasn't running a taunt lead, so will have trouble with Bisharp leads because of taunt and defiant, and Scrafty leads because all of them carry a non-attacking move (so if Uxie tricks, they might switch, but if Uxie locks itself into Twave, Scrafty might stat up and hit back hard and cause trouble). Of course all problems solved with Taunt lead followed by Uxie trick locking the dark pokemon into a dark move for Drapion to set up on. Also, yeah, Moody Octillery is certainly available. If I had the time I would want to try that thing out too.