For ease of use, I'll bundle a known bug list and 2 XSE header files so that people don't need to guess the indices of the new pokémon and items.
I will most likely also provide my ini for PGE so that people can see the new stuff in PGE.
Apart from that, what do you want documentation about?
I think most of what you have is good. If it is simple, can you add a tutorial about what you were talking about earlier. Where you are able to increase the number of pokemon slots but if it is to time consuming I think that's fine. Also, like I said, if you need any help with footprints or movesets I'm here to help!