I don't know if there's anywhere with bigger pictures, but they'll all on this page:
http://www.serebii.net/nobunaga/pokemon.shtml
I love how most of them are battle stances. Luxray's is probably my favorite, but I also like how Flaaffy's all "come at me, bro!".
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http://img94.imageshack.us/img94/4418/dsc02035h.jpg
http://i38.tinypic.com/2zqtqur.jpg