Pokémon is the story of a young boy named Ash Ketchum. Finally having reached the age of 10, he receives his first Pokémon from Professor Oak and sets out on his Pokémon Journey. Along for the ride are his best friends: Misty, Brock, Tracey, May, Max, and Dawn. Together, they journey through the Kanto, Orange, Johto, Hoenn, Battle Frontier and Sinnoh Leagues. Ash takes every opportunity to capture a Pokémon, Misty trains Pokémon of the Water type while Brock prefers Rock types. Tracey travels around sketching Pokémon. May started her journey for the sights and not the Pokémon but then decided to enter Pokémon Contests. Although Max has no Pokémon, he helps the group out with his handy PokéNav skills so as not to get lost but they still do from time to time. Dawn travels around to compete in contests like her mother did years ago.
Kanto arc (Season 1): Ash begins his journey to become a pokémon master. He starts his journey with his at first reluctant Pikachu, but the two quickly become friends. As his journey starts he is joined by Cerulean City and Pewter City gym leaders Misty and Brock. Together they travel throughout the Kanto region so that Ash can collect gym badges so that he can compete in the Pokémon League, while fending off the attacks of the villainous Team Rocket.
Orange Islands arc (Season 2): After losing in the pokémon league, Ash, Misty, and Brock head to the Orange Islands to retrieve the mysterious GS Ball. After obtaining it, Brock decides to stay and work with Professor Ivy to help him with his dream. As Ash decides to compete in the Orange League, they are joined by Pokémon Watcher Tracey. Together they set out on Ash's new Lapras' back and travel around the tropical islands, while still fending off Team Rocket.
Johto arc (Season 3/The Johto Journeys, Season 4/Johto League Champions, Season 5/Master Quest): After delivering the GS Ball to Professor Oak, he can't figure out the secrets of the ball. He sends Ash off to Azalea Town in Johto in order to deliver the ball to the pokéball expert Kurt. Reunited with Brock, the trio once again heads off for adventure in a new land so that Ash can compete in the Johto League, and prove that he is better then his old rival Gary. Not to mention Team Rocket continues in their quest to capture Pikachu.
Hoenn arc (Season 6/Advanced, Season 7/Advanced Challenge, Season 8/Advanced Battle): After settling his rivalry with Gary and ultimately losing in the Johto League, Ash takes...