@Toxicroak, look up at Wichu's signature, and follow the link to his tool thread, they are the best for hacking sprites and Icons.
I've got a theory, and if I'm honest I haven't read through the thread, so if this has been said/mentioned already just let me know (politely, thank you ^^). Those 25 "empty" slots surely have something to do with the Unown? That'd be why they have its cry? Could.. Gah, I had a whole elaboration planned out in my head, but it's gone:( essentially what I'm asking is, could they have something to do with the Unown? I'm hacking Emerald, and I would like to know from other people who have successfully inserted Pokemon over the "empty" slots in Emerald? Has it been tested- ie, open up a map, set the Wild Pokemon to a Unown and one of the newly inserted Pokemon, and see if multiple Unown forms still appear? [/babble]