This is a mitmproxy script that teleports you around the globe.
It's useful for playing Pokemon Go before it is released in your country.
This scripts intercepts all messages between the client and the server and translates all used coordinates.
The server thinks that you're in the target location. The client still behaves like it's in your current location as if the pokemons were really spawned in your local area.
First, you need to install mitmproxy.
Then do the following:
mitmdump -s tunnel.py --ignore '^(?!pgorelease\.nianticlabs\.com)' -q