Now you will need to do your save frame calibration.
To do a save frame calibration
1.Quickly start the game and collecting the egg(while pressing a). If you notice a npc moved while you were collecting the egg, the npc will throw off the frame.
(Since I told you to advance the date, the journal should pop up.
The journal will not affect your save frame. Once you exit the journal, quickly collect your egg)
2. Go capture a wild pokemon
3. Hatch the egg (doesnt matter if the egg hatches before you capture a pokemon)
4. In the seed finder, input the correct data and the IVS of the wild pokemon.
5. Once you generate that seed, click the Breeding Dppt method and generate.
6. Once it generate, find the save frame that correspond the with the IV of your egg pokemon.
7. Repeat this process 2-3 times. If you get the same save frame then you start to rng, If during you process your save frame move, its because a NPC moved and you will have to try to save on a frame when they dont move