Takes too long to list all of them. Stuck to just Generation 1 fully evolved forms (at the time). Honestly could have added more fully evolved forms.
Group 1: Too similar.
View attachment 166404
Lightened or darkened the color a bit, in most cases. Called it a day. May have made other, slight differences, such as Clefable's ear tips being green or a pink-ish hue on Golduck's bill.
Gave some other Electric types a pass, but not Zapdos. Felt more similar in colors than the others, like Electabuzz. Also declined to add Scyther for looking slightly better.
Group 2: Greeeeeeeeen.
View attachment 166402
Did not even show all of the green Pokemon. Left out a few out of kindness, like Golbat, Muk, and Tentacruel. Considers Dragonite the best in the group, thanks to the darker green, but even so...
Group 3: Worse colors
View attachment 166403
Lost Blastoise's really good blue. Needs Hitmonchan's boxing gloves to be at least kind of red (also very green overall). Turned Starmie from a three-color Pokemon to two. Dislikes the setting color too. Could be better with alongside other colors, though.
Recognizes the difficulty in making some of these better. Points to Dewgong as a really tough one. Will be too much of one color, regardless of what you do. Could improve it by adding designs. Involves more personalized efforts, however.