I don't know what you actually don't get but I thought maybe it's easier this way
.
ID Finder how to abuse
Let us take this for example:
PID: 7942ef72 (TIMID, ability 0) 31/31/31/31/31/31 (Seed: d2140289 Frames - 1: 114, J (synch): 71, J (no synch): None, K (synch): 71, K (no synch): 87) HP DARK 70
Hexflawless Spread generated with Wichus PokeRNG.
I guess you know how to do that.
After that: RNG as usual
(Calibration, etc.)
A normal delay for HG can lie between 5000 und 5700. for me it's easy to hit 5730 (I don't know why.xD)
If you abused succesfully, you will have a Shiny Spread on the PID you used.
Of course you can also use the delay PokeRNG gives you. In the example case it would be: D2140289