I have noticed that in some cases Swarm brings mons that don't normally come from said route. If im not mistaken it also ups encounter rate but I can be wrong due to Illuminate already does that.
Hey there Transendence.. It is okay if you take your time. I am in no rush tbh I thought id have to wait longer to get a reply onto a lead about this Ninetails. Valuating A shiny like this can certainly be a tricky issue. there are Ninetails Alike up for around 20m. I would not mind paying a little more for it. once you are done with your vacation we can talk more about it.