I really love PMD1, but its biggest flaw to me was the lack of portraits for many of the starters' evolved forms. I would like to add a few of them into the rom just for the sake of it, by using PMD2's face portraits (as, so far as I can tell, they are the same size and still have the 16 color limit) but the problem is that I am not precisely sure how to get started.
I've delved into the rom before, and found that EVERY Pokemon has a "starter level up" quote in the data, even though it's stuff like partner_level_133 or whatever, and it was likely input as a failsafe. Seeing as how this sort of thing exists, I'm wondering if a similar system is present with the face portraits. As in, there's an actual table to portraits listed somewhere, with likely a byte to tell the game to not try loading for certain Pokemon. If this is true, it would be possible to edit the table, insert a new portrait into clear space and point the game to the image.
However, I actually cannot seem to find any sort of hacking notes on PMD1. If anyone could help me by pointing me in the right direction. (Either to hacking notes, or directly telling me if this is or is not possible, and if it is, where to look.)