Judging by the 'Data' page on the other two versions (PS2 and Xbox), there's a EU release scheduled ... uh, "to be announced". Originally it was supposed to be a worldwide release (US, EU, and AUS) but so far as I've heard the non-US regions fell through. No idea why.
If you have a PS2, GC, or Xbox that can play US-region games, then of course you could import a copy via amazon, ebay, etc.
Up, Up, Down, Down, Left, Right, Left, Right, B, A, Select, Start: The 2P classic code.