I love Lucario's movie, Manaphy's movie Arceus' movie and Victini's movie.
Lucario's movie - simply because of Lucario, thanks to this, he became my no.1 Pokémon.
Manaphy's movie - Manaphy. The cute thing was irresistible =D And how they portraited Satoshi's and Haruka's relationship there was marvelous.
Arceus' movie - Arceus, Arceus, Arceus, nuff said.
Victini's movie - Firstly it's a reason why I love BW, Aoi Yuuki. Secondly, Victini. I really love the cute legendaries :D And the plot, characters... everything seemed different. Like... more mature if I were to describe it.