it works, but a lot of steps.

1) rooted phone, obviously
2) fake gps apps to fake gps locatiom obviously
3) bcoz fake gps uses mock location, u hav to enable developer option & set to allow fake gps to mock location

now the problem. bcoz pokemon go detects mock location, u hav to hide that settings from pokemon go.

4) install exposed installer
5) install mock mock location 1.4 module (hide mock location doesn't work)
6) enable the mock mock location module

now, it shud work, but, yet there is another problem.
bcoz ur phone take location not only from gps, but wifi, bluetooth, & cellular scanning as well, u will experience teleportation between fake &, real location.

7) make sure gps set to device only, & disable all scanning options
8) install DisableServices or my android tools.
9) launch above apps, in system services, disable fuse location & & all the blue color services in LocationServices
10) restart phone

now u can use fake gps.
beware not to teleport too far as this might result in ban.

the down side, ur phone real gps no longer works.
to make it work again, u hav to go in DisableServices, enable bck all the settings, then restart phone.

this is the price to payof being a lazy ass.
but hey, worth it!!

but do make sure no teleportation, once kena ban, gone la.