I vaguely recall the game for the gamecube but I remember it being much more darker than your standard pokemon game.
You play as a badass anti-hero at first, and the ability to steal trainer pokemon and get shadow pokemon was a bit cool as well, giving moral decisions to the player.
I really found it to be much less light hearted, and yet, it was still playable for kids obviously. I can't remember a pokemon game that was more darker than it, but I haven't really played any of the new ones. Thoughts?