Haha, that's because, unlike breeding, you can not get flawless spreads with your ID/SID all the time. It's hard to find a few usable spreads, let alone quintflawless. That's why people abuse for their ID/SID combo.
When you search for spreads, I would recommend you going higher than that, try at least 600-1200 for delays.
Ok, so I did a search with your ID/SID on Timid nature with these parameters 20/0/25/27/25/27. The best I got was this:
Seed: af1705ce 21/31/25/31/29/31 HP Dark 49
Seed: 9d0904de 30/7/30/31/31/29 HP Ice 64
Again, getting good shiny spreads is very difficult and it's just based on luck. If you are planning to capture something with those spreads you will still have to check if they exist for Method J (not all Method 1 spreads are available for Method J) and also check the which encounter slots you have for that given spread. I'll be able to help you later when I get back home if you have more questions