Authentic Nintendo DS cartridges have a label that takes a sharp right angle on the bottom left corner. Fake copies will instead be rounded on the bottom. The serial code on the bottom of the label should also match the serial code that is on the back of the cartridge.

Pokmon Go's location permission lets it track where you are, how long you've been there, and events during gameplay. Niantic can use this information to show you ads for businesses in that area.