Audino, Shellos, Blissey, Trubbish, Gastrodon, Sewaddle, Drifloon, Ledian, Spinarak, Munna, Musharna, Swablu, Yamask, and Togepi are my favourite cute Pokémon. There's probably more.
When I read that Yamask looks at its mask and sometimes cries, I just wanted to hug it! Plus its cry is cute.
Am I the only one who feels really bad making all those Audino faint for experience points in Pokémon Black/White?