>>31794815The Pokemon occult is at least pretty straightforward. There are plenty of ghost types, all of them easily recognizable at a glance, despite being ghosts they mostly abide by the laws of the natural world (at least as much as anything else in Pokemon does), and there are known and well documented ways of defeating and capturing them.
When you think about it, a trainer obsessed with ghost types isn't any more strange than any other monotype trainer.