So many cutemons that I don't even know where should I start.
Well I just love the pokémon shuffle sprites (as for the game itself, not so much) so I am going to start with them. I guess that the beautiful shading, the bigger eyes and the big black outline from these sprites helped most pokemon at becoming much, much cuter looking.
Now lets go for some main game sprites.
I just find it adorable how it is trying its hardest to look menacing by roaring at you, but that only makes it cuter in my opinion.
I don't really know why but I just love the chubbier looking Pichu from gen 2.
Yeah, it is Aron again, but come on, it is like the cutest pokémon ever in my opinion, and knowing that it is going to become the baddass that Aggron is, is just 100% awesome.
I love how it keeps doing these little jumps, and it reminds me a lot of my Yorkshire.
This is an odd case. The sprite itself doesn't depict Charmander too well, but the fact that is trying to breath fire and making this hug like movement makes it earn a lot of cuteness points to me.
The best Dragonite sprite period. It just looks adorable, who could tell it is such a beast in competitive (by the way, his gen 6 sprite destroyed everything that the gen 2 one did).
I comitted a criminal mistake for forgeting to include Wooper's gen 6 model, so I HAD to edit this post. Just look at that face and dem movements tho.
If I had to say, I think that the champions of cute sprites are in my opinion Pokemon GSC and Pokemon Shuffle.