Yes, FoneGeek iOS Location Changer works with all location-based apps including Pokemon Go.
FoneGeek iOS Location Changer enables you to change your iPhone location without jailbreak, so you don't need to worry about data loss
Location on any location-based App can be changed on your iPhone, such as Pokemon Go, WhatsApp, Facebook, Google Maps, Snapchat, Tinder, etc.
Generally, the settings on your iPhone will keep unchanged, excepting the settings related to location will be changed correspondingly, including time, weather, longitude and latitude, etc. However, you can simply restart your iPhone to recover the real location and data.