Thanks again but I did some trial and error and found the problem. I dunno if it's a bug or something trivial but I'll explain anyways. Seed A: It just won't work at Celestial Tower, 2F. Why? I have no idea. It worked perfectly in a random patch of grass outside of Giant Chasm, encountered a Golbat by accident. I realized the frame was off by 20 as opposed to the calculated initial frame. So I took the actual frame with the seed, tested the pattern of natures, hit the right nature at the right frame but no shiny (at Celestial Tower) Just to be sure I tried a different seed in first floor of relic castle and it was perfect. Maybe it was that particular seed or something but yeah.