Well, all Gen II and III Pokemon have the same sprite in Ruby & FireRed (except Teddiursa), while Emerald's Frame 1 sprite for Gen II and III Pokemon are exactly the same as their Ruby & FireRed sprites, so I don't see the point in making new frames, 'cuz Gen II & III Pokemon use the same sprites in all 5 Gen III games. The only Pokemon that got a completely new sprite in Pokemon Emerald is Snorlax. Koffing and Dustox were edited a bit, and that's all.
In my thread, the reason why I have a list for Gen II and III Pokemon is because I was planning on making custom sprites for them.