>>58903549>>58904382A lot of sprite changes from Ruby and Sapphire to Emerald appear to be due to finger number. Snorlax has 3 fingers in RS but 5 in Emerald. I already remarked on Mr. Mime, but Poliwhirl and Poliwrath each had 4 fingers in RS but 2 and 3 respectively in FRLG and Emerald.
Haunter and Raticate still have 4 fingers though, their de-fingered would have to wait until DP.
>>58904425I think they were still deliberating on whether to retcon Ash's Butterfree's girlfriend as shiny or not. They settled on "no" I imagine because they didn't want to risk kids believing it was just a gender difference and accidentally K-O'ing it.