There were some posts on this subject in here but I saw fairly mixed answers.
I'd like to discuss / question about replacing of the Unown and what can and can not be done. Looking at them in Unlz-GBA, there is a normal unown A sprite in with the 2nd generation pokemon. The rest of the unown are located past jirachi/deoxys/chimeco/egg, and have strange palettes. My thinking is that if they are all indeed stored separately like that, not combined like deoxys, why CAN'T they theoretically be replaced by any normal pokemon sprites? If one were to offset and repoint the image and palette data, would you not get a (graphically) unique pokemon? I suppose their move pool will still be the same however, and the encounters would still be random (unless there are tools that can see the different lettered unowns as separate pokemon, or perhaps a method via hex).
Even if that idea does not work, one should at least be able to replace the later unown sprites with new art if they all shared the original (A) unown's palette, correct? So you could make either very simple or very monochromatic sprites on the unown slots (i've bene thinking about using that to make silver and gold "trophies" on them if that is the case).
Anyone actually TRIED this, and if so, how did it turn out for you? I'm going to attempt it in a few ways over the next couple days and I will edit this with my findings. Let me know if I am way off base here, but looking at the way they are stored, I don't see why this couldn't work.
Oh, and to make this post a double purpose, what do you guys use for editing Dex entries in FR/LG? Best I have is a thingy32 table file, but holy crap is that ever tedious. If the table file could help anyone out there whip up a nice GUI program for it that would be wonderful and I'd be glad to share it.