Got it. If you've done everything correctly, then yes, your starting PID is 53. So now, reset your game, do your RNG process the same way, and this time, before you pick up the egg, go to the Pokemon Party menu and listen to Chatot 73 times; since you're starting PID is 53 and your goal is 126, that's how many times you have to listen to Chatot to advance the PID frame.
You filled in everything in the eggs tab, right? If so, in order to determine your starting PID, you need to hatch the egg. Once hatched, you check the stats, nature, characteristics, gender, etc., and compare it with the results in the eggs tab. And you can't use quick hatch. The starting PID for an egg seed will most often then not change.
Really? Are you saying that those IVs you listed in the Simple Request thread aren't right? If you're not looking for a shiny Pokemon and the IVs you listed were right, then I guarantee you should be able to find over 1000 seeds with the IVs you want.
Anyways, from what I gathered, you're just looking for a flawless Deino with Dark Pulse. You already put in the parents, the Day Care Guy has an egg ready, and your saved with a party of at least one Chatot and a Flame Body/Magma Armor ability Pokemon, right?