I enjoy reading at everyone's different opinion..... my most overall cutest Pokemon (at least for me) is Watchog!! Don't know why, it just is, its the look in those eyes that really gets to me....
Other gens - my overall cutest would be:
Most of them I had a hard time deciding as many also fit in
• Kanto - Persian - that cream colored looking fur, the red gem
• Johto - Furret - looking at my real life ferret in my room, I can just imagine how it would move or play
• Hoenn - Linoone - same reasoning as Furret above
• Sinnoh - Buizel - love otters so much, I will always find them cute, how they move, how they play
• Unova - Watchog - my #1 top cutest Pokemon, the hypnotizing eyes, fur markings that glow, general from head to tail I just find cute on Watchog. everything I love in a Pokemon it has, and its Japanese voice!
• Kalos - Helioptile [at least for the ones introduced so far] so far the design looks cute, wonder what its voice will sound like