I much prefer Duskull over both of it's evolutions. I love the design choice of having one eye for both sockets, it makes it more interesting to look at and kind shy looking? That might be the arm pose though.
I actually like all the Porygons equally more or less, maybe with a slight bias towards Porygon2. They all have their unique charm about them... Eh, I probably like Porygon2 the best, digital rubber ducky ftw.
All the cuter ones: Bulbasaur, Abra, Mareep, Helioptile, Inkay, Floette, Litwick, Venipede, Buneary, Phantump, Noibat, Litten, Steenee, Cosmog, Poipole And also: Dragonair (much more graceful), Slugma (especially in shiny), Alolan Meowth, Snivy (I like the design more), Glameow (I mean... just look at Purugly), Salandit
I like Dragonair a lot more than Dragonite, mostly because it looks so much more sleek and graceful. I also like Cyndaquil much more than Quilava because Quilava just has an awkward body pose... and in 3DS games it looks rather, er... phallic. Others include Phanpy, Larvitar, Minccino, and Frillish.