>>43398193I think the Plesio got a new sprite in the files, you might want to check that. In those sketchpad sprites.
If you can list sources for where each sprite comes from, to help make it clear. Color coding with boxes could make it easy (Red box for Korean, Blue for Spaceworld '97, etc.) Also as a heads up a few of the sprites on the sketchpad and korea releases look similar to their Spaceworld counterparts but are actually minorly different, so they're worth including if they're there. Also include the '99 silver sprites, we can see they're clearly early iterations of designs for some Pokemon, like Feraligatr's. There's no reason to exclude them.
Also don't do stretches like "balloon was drifloon all along". It's just goofy stretches with no reason to actually believe it. You could maybe make an argument for a few with Gen 3 mons, but overall if it didn't appear in Gen 2 just don't include them.
Lastly the top mon was never an official Pokemon design, just a concept made by sugimori.