this is a trick I verified and it's also the reason I said to pick an odd numbered frame, like 3 or 5 or even 7. Remember Youngster Joey? Calling him will advance the frame by 2. Apparently he does this whether he wants to battle you or not. He will want to battle if you call on Monday. If that bothers you or you think it's messing up your frame advancement on your game, beat the crap out of him before you RNG for shiny eggs. It doesn't matter if you call Joey before putting the parents in daycare or after. I have discovered that incoming phone calls generally ruin my results and I never managed to get a shiny egg if it wasn't at frame 1 to begin with, until I used Youngster Joey to advance my frames. So use him. ."- Riski's guide
Idk if I was reading the wrong part, but somewhere along the line it says about going quickly because of some NPC