GS sold 75.52% of RGB numbers
RS sold 68.43% of GS numbers (and 51.68% of RGB numbers)
cold hard TRUTHNUKE is that gen 3 had a harder drop in global consumer interest and not in raw millions alone

>b-but muh third versions!!
face it, most of the people who bought them were double dippers who already had the original release, possibly excluding part of yellow sales for being released literally at the peak

>b-but it was on a different, newer system!!
wanna use that argument for crystal too which was a GBC exclusive and not playable with the original gameboy or pocket unlike GS?