I missed this game when it came out sadly, but I made up for it just a week ago. One of the best Pokemon games and stories out there, and it really made me feel good for playing it.
I think the main 3 characters are the most endearing in all of Pokemon.
Lavish, I don't know where to get it offhand, and my first recommendation would just be a YouTube Downloader...
But, since I'm not much help, I'll give you my favorite PMD song in the most wonderful remix I've heard for it. Beautiful tragic melody.
http://www.youtube.com/watch?v=LEnNmFQrjyA