The Pikachu portrait is only in Wonder Rabbit, Five Kids and Monster Brother's CHR data. It's not there in Gardman and Diveman. More precisely, Wonder Rabbit, Five kids and Monster Brother retain the portraits in their CHR data but do not display them by not putting the tile numbers into the status bar's tilemap, while Gardman and Diveman retain the tile numbers in the tilemap but clear out the CHR data instead. This suggests that Gardman and Diveman are separate branches of hacks.
Attached all versions I have, sans the A+B version of Wonder Rabbit, which I did not consider worth keeping. I have also included a hack that I just made where I copied the portrait tile data into the cleared-out CHR bank of Gardman. It would have been better to restore the tile data in Monster Brother, but that one seems to have the entire portrait code itself removed.
Gee, now I really want that unknown Pokemon game...
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