From Bulbapedia, the community-driven Pokémon encyclopedia.
Pokémon manga (Japanese: マンガ), unlike the Pokémon anime, does not actually refer to one specific manga or one particular piece of Pokémon canon but, rather, an entire subcategory of comics written with their own storylines and interpretations of the Pokémon world. These frequently have no connection to one another beyond their medium.
Many Pokémon manga are never translated into English. This is probably because of manga being more traditional in Japan, and most have innapropriate scenes such as in Pokémon: The Electric Tale of Pikachu, however, this is an exception. Sometimes the artwork is cleaned-up for foreign publishing, but some Japanese publishers prefer not to have the artwork changed.
List of Pokémon manga
Video game adaptations
Movie manga adaptations
Direct adaptations of the Pokémon anime movies, sometimes with small changes in the story or Pokémon featured.