Pokémon Crystal

The player is called to Professor Elm's lab to run an errand. He provides the player with one of three Pokémon: Chikorita, Cyndaquil, or Totodile to help him/her get to Mr. Pokémon's house. The player meets Kanto's own Professor Oak during the errand for Elm. Oak, convinced that the player has started his/her own Pokémon journey, gives him/her a Pokédex. On the way back, the player is attacked by a spiteful and mysterious Pokémon Trainer. Upon his/her return to New Bark Town, the player is informed that someone has broken into Professor Elm's lab and has stolen a Pokémon, the same Pokémon that the Trainer from earlier battled with (the Pokémon that the player's starter is weak against); even more so, that very same Trainer fits the description of the Pokémon thief. This Trainer will become the player's rival for the course of the game, having several conflicts with the player as to what it means to be the world's greatest Pokémon Trainer.