I like the little ones, they're so cute and most of them have awesome cries. Pichu, Chimchar, Natu, Shinx, Piplup, Smoochum, Elekid, and Aron top my list.
Now, as to evolved pokemon that I think are cute, well...NidoQueen looks cute and tops my list. Others: Jynx, Pikachu, and finally Meganium.
Dang you had to pick a hard question! Hahah! Ummmm....I'll say JigglyPuff...Mew...Pikachu..and Celebi!! There's not once I've watched a pokemon episode or movie and those pokemon haven't made me say Awww.