I'd suggest interviewing Dominique (and the Martacus) for this precise reason, just to dead-on confirm (though we don't want to directly talk to the Martacus about this). Who knows? We may be dealing with an odd, hithero unknown variety of botanical nightmare grown by a non-grass Pokemon to frame up the Martacus.

Then again, we may be giving the Enthrallers far too much credit for their own good. They may be too, well, insane. Who knows? The unconscious Pokemon in the locker might be the Exorcism tutor. Or something.