Pokémon has not only proved itself as a leader in the video game industry, but it also has become an obsession for millions of zealous fans. Pokémon has spawned more than $15 billion in worldwide retail sales, while the franchise is on the verge of selling its 150 millionth game worldwide. Without fail, every new Pokémon game sells more than 1 million, while the legacy has grown in the United States since its introduction in 1998. But the newest game speaks for itself - Pokémon XD: Gale of Darkness launched Oct. 3 for Nintendo GameCube and is the next step on the ladder of success for Pokémon. As fans have grown up, so has the game.