>>33007971It's also worth pointing out that some Pokémon receive new stock art depending on the release.
For example, Chikorita, Cyndaquil, Totodile, Raikou, Entei, and Suicune all received new stock art for Crystal, and most Gen II Pokémon received new stock art for HGSS.
Treecko, Torchic, and Mudkip received new stock art for Emerald and more new stock art for ORAS.
Turtwig, Chimchar, and Piplup received new stock art for Platinum, and would presumably receive new stock art if Gen IV gets a remake.
Snivy, Tepig, and Oshawott received new stock art for B2W2.
Chespin, Fennekin, and Froakie only have their X and Y stock art, but if Z had ever been a thing, they likely would have gotten more.
It's likely that USUM will have new stock art for Rowlet, Litten, and Popplio.
Gen I Pokémon had their RG stock art, then got Blue stock art, and would get new stock art for everything in FRLG.