I have some really bad news about the “map.” Assuming the dens are correct on the website, the dens move around every time the raids reset. I had a location pegged down to one of two dens, got new raids and tried again and got a pokemon that couldnt be in either den. Furthermore I was doing tests with another game side by side and had a similar issue occur. Hopefully Nintendo patches this so its easier to hunt for Gigantamax Pokemon.