From Bulbapedia, the community-driven Pokémon encyclopedia.
Pokémon Adventures (Japanese: ポケットモンスター☆SPECIAL Pocket Monsters ☆ SPECIAL) is a manga series authored by 日下秀憲 Hidenori Kusaka and illustrated by 山本サトシ Satoshi Yamamoto and by 真斗 Mato before volume 10. It is published by Shōgakukan under the Ladybird Comics Special series. The series is popularly known as Pokémon Special, and affectionately abbreviated as PokéSpe (Japanese: ポケスペ PokeSupe). This is mainly a game-based manga, and therefore, unlike the anime, some legendary Pokémon are caught by main characters.
The series was published in the United States in English by VIZ Media, yet publication stopped after the second chapter ended. The series is published in Singapore in English by Chuang Yi.
Creator of Pokémon Satoshi Tajiri is quoted recommending this on volume 1:
- This is the comic that most resembles the world I was trying to convey. 
Pokémon Special has had several story arcs which span the four generations of Pokémon games so far. The names of the chapters correspond roughly to the names of the protagonists of each.
Red, Green & Blue chapter (Volume 1~3)
- Main article: Red, Green & Blue chapter (Special)
The RGB chapter features the journeys of Red and Green through Kanto, conquering the eight Gyms and the Pokémon League. Later, a third trainer, Blue, comes into the plot. Together, they destroy Team Rocket, an evil organization which uses Pokémon for illegal actions. There are also adventures of Red helping Blaine to capture Mewtwo and saving Yellow from wild Pokémon in Viridian Forest. At the end, Red defeats Green in the Pokémon League.
Yellow chapter (Volume 4~7)
- Main article: Yellow chapter (Special)
The Yellow chapter starts two years after Red obtains his title of the Champion in the Pokémon League. Red disappears for one month after he leaves to answer a challenge from someone named Bruno. One day, Professor Oak discovers Red's Pikachu, Pika, injured at his doorstep. Soon after the arrival of Pika, a young trainer comes into the Professor's lab. The trainer, Yellow, claims that "he" is a friend of Red and wishes to look for him with Pika. While Professor Oak is still skeptical about Yellow, especially about "his" ability of healing and sensing Pokémon's emotions, he eventually entrusts this mission and Red's upgraded Pokédex to the young trainer. However, this event only triggers the revelation of a larger secret as Yellow is repeatedly attacked by members of the Elite Four.
Gold, Silver & Crystal chapter (Volume 8~15)
- Main article: Gold, Silver & Crystal chapter (Special)
As peace is returning to Kanto, new journeys and happenings are beginning in another region, Johto. Gold was enjoying his normal life with his family Pokémon, who have been with him since birth, until he ran into a Pokémon thief at Professor Elm's lab. As he goes on a journey of chasing the thief, Silver, with a Cyndaquil from Professor Elm and Pokédex from Professor Oak, he stumbles upon the secret plots of the Mask of Ice. At the same time, Professor Oak sends out a "Pokémon Capture Professional", Crystal, on a journey of completing the Pokédex. She gets involved in Eusine's plans to capture Suicune and tries to do so herself. Soon after, she also gets involved with the plots of Mask of Ice, who is apparently after the two legendary Pokémon, Lugia and Ho-Oh. The more shocking revelation follows: this Mask of Ice is actually one of the 16 Gym Leaders of the combined Kanto-Johto area!
Ruby & Sapphire chapter (Volume 15~22)
- Main article: Ruby & Sapphire chapter (Special)
Things have just settled down in Kanto and Johto, but another new region coming on screen. This chapter is about the "rivalry" of Ruby and Sapphire, who are trying to conquer all the Pokémon Contests and Gyms in Hoenn respectively within the span of 80 days. Just like their counterparts in Kanto and Johto, they encounter two evil organizations, the land-loving Team Magma and sea-loving Team Aqua. However, on top of their gym battles and Pokémon contests, the two teams and the balance of nature, Sapphire and Ruby have to worry about something else, too: their feelings for each other...
FireRed & LeafGreen chapter (Volume 22~26)
- Main article: FireRed & LeafGreen chapter (Special)
The FRLG series continues the series featuring the characters Red and Green as they are forced to explore the Sevii Islands to look for Professor Oak who got kidnapped by a Deoxys. Meanwhile, Blue has finally located her parents, but as she is about to meet them, they get swallowed up by a mysterious black hole. Red, Green, and Blue must locate the missing relatives with the help of a former foe, Lorelei, the psychic mutant, Mewtwo and a mysterious old lady, Kiwame, while defeating Team Rocket again at the same time. Back in Kanto, Silver is seeking his parents as well, with the help of Yellow. He is soon shocked by the revelation of who his father really is...
Emerald chapter (Volume 26~29)
- Main article: Emerald chapter (Special)
The Grand opening of the Battle Frontier takes an unexpected twist when Emerald appears on the scene. Now he must conquer the seven facilities in seven days. With a seemingly unmatched ability at battles and access to every Pokémon Crystal has ever caught, the mysterious stranger that attacks Noland and is seeking Jirachi, Guile Hideout, may be more of a worry, especially if he catches Jirachi first...
Diamond & Pearl chapter (Volume 30~?)
- Main article: Diamond & Pearl chapter (Special)
An important family from the region of Sinnoh sends their last descendant Platina on a special mission with two bodyguards. Platina instead meets with Diamond and Pearl, who coincidentally match the description given to her (two boys in scarves, one in red, the other in green). They join her, believing that by accompanying her to Mt. Coronet they will win a prize from her family, but it won't be easy.