80112A04 is a RAM address, not a disc file address.
If it's replacing a line of code, you could try a debugger to read the data in RAM at that location ingame, take a sample, and use it to locate the same data within the disc, where you would be able to modify it with the value you have.
If it's replacing some other value stored in RAM, you'd have to debug and monitor whenever the address is being written, and track down where those values come from. Quite more involved.
Either way, a GameShark doesn't give you enough data to reliably hardcode the same change, but it's a valuable starting point. With a bit of debugging experience, it's all you need to find what you're looking for.