I believe it is centralised, as I'm pretty sure the same Pokemon can appear on multiple players' devices in the same location. See here for consequences: http:

I believe it is centralised, as I'm pretty sure the same Pokemon can appear on multiple players' devices in the same location. See here for consequences: http://www.nbcnewyork.com/news/local/Pokemon-Go-Players-Stampede-New-York-Central-Park-387303572.html http://www.nbcnewyork.com/news/local/Pokemon-Go-Players-Stam...