Well, first find out what the fastest delay you get.
So what you do is go through the beginning as fast as you can. Making sure you know what minute you're on when you first get into the game (once the Red Gyarados screen goes away).
When you get into the game. Just pause it, go to your Trainer card.
Go to RNG reporter, open Pandora's Box. Input the data in the boxs on the far right of the window.
The ID you got, Month, Day, Year, Hour, Minute. Minimum and Maximum delay. Since you'll be hitting a relatively high delay. You probably should fill in 3,500 as minimum and 5-8 thousand as maximum. Depending on how fast you think you were.