just play the app before you play the game and set your location where ever you want.
First Clear Game Catches
There is 2 Buttons;
1- Set the location
2- Walk .
NOTE; BEFORE you play be sure that your MOCK Location is Enabled in developer setting.
NOTE : WHEN you first start the apptry to be in walk (Walk a little bit in your room to detect the walking from GPS)
Then open pokemon GO and Go Everywhere . now you can open all eggs you have in your bag.