I was doing some research on Eggs. I found something that seems to make RNG abusing Eggs in HGSS very hard to impossible. I double checked to compare it to platinum to see if it was the same before coming to this conclusion. In Platinum you can put both parents in the day-care and the RNG is never called once, untill you leave to house. This makes me think that as soon as 2 compatible parents are in the day-care, an egg is made based on the current seed, but held from the player until they take the right amount of steps. Now, in HGSS as soon as you give the Day-care lady one parent, the RNG gets calls of about once persecond. This is why I think it will very hard to impossible to RNG abuse Eggs in HGSS, because by the time you can get the other parent in the daycare so the game can make the egg, the RNG has advanced quite a few times.
I believe what you were looking at was the Breeding IVs, not the PID.