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I only know a little bit for HG/SS:
1.Unzip arm9.bin
2.Go to address 0x70080
3.The byte here (08) is the shiny probability.
08 = 1/8192
as of Gen 6 its now 10 = 1/4096
if set to maximum FF = 1/257
4.Save the byte however you want.
I got you! For D/P/PT you want lines 000F6B90 dor D/P and for PT you want line 000EE120. They all want you to change 9F 01 for the map header number. For the "XX XX ZZ ZZ YY YY 00 00 PP" you want the line after that. Start at 04 00 for the XX XX and go right from there. For D/P/PT you don't...