Aside from this, I think the biggest problem with Multis is the accessibility. In order to get a usable partner, you have to scout them in Singles first... which requires you to play Singles, thus taking away time that you could be playing Multis (it's like you have to play a different mode to even have a chance of starting this one). And everything is random, meaning that you have to actually find (and beat) a good trainer in order to scout them. People in this thread have racked up hundreds of wins looking for specific trainers and never found them.To be honest, I consider Multi with AI being very fun in B-tree.
What it fails being fun at is the frame rate. It's UGLY and UGLY is a compliment for someone with a normal 3ds like me. I've got as far as 50 with Cynthia for the stamp, but the terrifyingly low frame rate is really hurting my will to commit :(
XY did it better by letting you use your friend list as partners, and it was easier to "scout" people by adding their Friend Code (I know a few people whose trainers with Scarfed Eruption users were popular). ORAS nerfed it by limiting you to 4 preset partners, and then this game added yet another entry barrier, pushing away even more players.