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Green had terrible sprites
Blue had significantly improved sprites
Yellow took it a notch further for downright impressive spritework
GS had a few dudes but hit above blues level
Crystal has the best spritework of any iteration of pokemon, which I think is a hidden reason for its continued reference among the fandom. It's such the perfect mix of accuracy and personality
several of these went on to have terrible ports into gen 3, a low point in the franchise for any mon that wasnt in the hoenne dex
3D partially fixes the graphics issue but they need to address the personality issue, hitmontop not spinning like it should being one big example