hacking Help with changing shiny odds in Pokemon black/white

[Noodleboiby]

okay so I have been trying to find the offset for shiny rates so I can attempt an all shiny nuzlocke. However, when I extract the arm9.bin file and load it into a Hex editor, it says that the offset doesn't even exist. How do I find the offeset if this is the case? Better yet, are there videos showing a step by step to show me what I'm doing wrong? 

I would like to add that I can find the offset easily in other pokemon games, but not black or white.