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I want to make trainers pokemon to be shiny? Can i implement this?
Shininess depends on Pokemon IV. From what I know already, different trainers have different IVs. For example trainer Cal and your rival has high IVs, when I changed shininess condition into IVs of at least $CCCC, their all Pokemon started to be shiny. So I think best solution is to find the ASM of IV distribution amongst different trainer groups and make it give the proper trainer groups proper IVs which determine shininess.
Tools like BGB debugger are necessary if you want to set a watchpoint on enemy IV. You can also find the RAM offset of enemy IV and search for the routine in hex editor, by writing hex equivalents of commands like "ld register pair, into enemy IV offset", "ld register pair with IV" "ld a with the register pair". Try it with all register pairs. If you will see trainer group checks "cp trainer group", "j z/nz $x" nearby, you should be there.