The concept of the Pok?mon universe, in both the video games and the general fictional world of Pok?mon, stems from the hobby of insect collecting, a popular pastime which Pok?mon executive director Satoshi Tajiri-Oniwa enjoyed as a child. Players of the games are designated as Pok?mon Trainers, and the two general goals (in most Pok?mon games) for such Trainers are: to complete the Pok?dex by collecting all of the available Pok?mon species found in the fictional region where that game takes place; and to train a team of powerful Pok?mon from those they have caught to compete against teams owned by other Trainers, and eventually become the strongest Trainer, the Pok?mon Master. These themes of collecting, training, and battling are present in almost every version of the Pok?mon franchise, including the video games, the anime and manga series, and the Pok?mon Trading Card Game.