Lost in the Haze
The main storyline revolves around a boy named Chris who winds up on a pokemon journey without a pokemon[/conventionality]. He meets a girl named Lucy, who isn't really what she seems. She's quite detached, while at the same time appearing to be warm and friendly. Her true identity and past are amongst the myriad plot twists that make this fic so enjoyable. Alongside their journey, in a different place but intertwined with the main story is a Pikachu who has evolved from Pichu but forgotten how to use electric attacks. The two journies collide eventually, brought together by the appearance of the Haze, a destructive force able to take the form of the legendaries.