Pokémon Adventures, Vol. 4 (2nd Edition) by Hidenori Kusaka

Pokémon trainer Red goes off on a training challenge and...never comes back! But a tired and tattered Pikachu manages to return home by himself. A mysterious young trainer in yellow befriends Pikachu, and together they set out to find our missing hero! Watch out for Team Rocket, Yellow Caballero... Could they be behind Red's mysterious disappearance? Pokémon Manga - Gotta Read 'Em All! Adventures based on the Incredible Gameboy, Nintendo, and Wii RPGS!