I always thought this game was pretty cool considering graphics animations and everything else in general. I thought this had some pretty good game play.
Basically, in a nutshell, one member of the Team Snagem Syndicate breaks out with the Snag Machine. Now you play as Wes (His default name) to snag all the shadow Pokemon and purify them. His enemies are that of Team Snagem.
Overall, I think this is a pretty fun game and it has always been one of my favorites.