As for the question:
To successfully edit would require ASM I'd think (though maybe there is a way to do it in hex).
If you scroll down, you'd find that the offset is at 0x02024284 in FireRed.
I lied, I don't think there is a way to do it in hex. Unless you want to standardize a specific nature to a specific breed (then again I know nothing ).
When I said labels, I meant that it is labeled as. If you open uo the memory in vba, it shows the ram. 00 is BIOS, 02 is WRAM, 03 is IRAM, and so on. When you get to 08, this is the actual rom. By putting 08 in a pointer, you are telling the engine that the pointer is going to the rom and not another place in the ram. I called it a label, because it's like a number equivilant of the label "rom".
The location you showed is in the ram. What was being asked is how to change it in the rom so that later it can be used by the game. If it is only changed in the ram, you would most likely have to change those values each time you loaded the game.
Now that I followed the link, that is the data structure for a stored team or the pokemon in your pc. By changing the nature there, you would only change what nature that party pokemon had. It's also encrypted, though JPAN has a nice long post on how to work with it.
Romancandle: If you feel like scrolling through the entire rom, look for a pointer table that is only 25 or 26 pointers long. Don't know if it will have a nature at 0 so that would make the table one pointer longer. The table you encountered might be related if it is indeed the proper length. You would just follow the pointer, though I fear it is much more complicated and probobly involves an asm routine at the other end of the pointer.
tools being used-
Advance Map 1.92
Many credits to their makers
and to those who keep this community toghether
This tutorial by link12552 has a very good explanation of bridges near the end. Here is the quote in the spoiler: