Dissidia 012 Duodecim Final Fantasy - ULUS10566

[LunaMoo]

Well, when making cheats or any kind of patches like that you always have to start from something you can easily affect in game like a variable that stores some value in this case assist bar. Then set a memory breakpoint on it then follow the code back trying to understand what you're looking at and how the game works.

As for deciding what to patch in this case the code deciding whenever to activate assist or not was pretty short and what can be seen on that screenshot above 08AEEAB4, 08AEEACC and 08AEEADC all skip the same code and there's nothing that saves anything between them or being used later, meaning code could be patched in any of those places with same result. Disassembly shows such things pretty clearly, maybe even obvious with some experience, so to have it easy creating such patches you only need to learn MIPS, experience with that is more important than knowledge, so it's not that hard to learn, just takes time and practice.