Here's the current progress on Gen IV sprites
I'm just behind those particular mons backs so can definitely get to those shortly.
The eventual aim of my resource is to include Gen II/Yellow devamps of everything (tilesets, maps, townmaps, trainers, music, games etc. though gen II is now the main focus) so emotion sprites for all pokes, while the least important focus (as much as Yellow is my first and favourite game only a few pokemon will likely be used in hacks) are definitely in my list so I'd be happy to help with another! Though my favourite is Pikachu with it being my first pokemon haha