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… More 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.
While they are traveling, Ash and friends meet Kotone and Kazunari, who are from the region of Johto. Dawn and Kotone have a battle in which Dawn wins and gets an egg. After Team Rocket steal it and they get the egg back, it hatches into a Cyndaquil.
Having managed to trap Ash and his friends inside their secret base, Team Rocket is overjoyed! Suddenly, they hear noises coming from the storeroom next door. Upon having a look, they discover a Togepi, a "Spike Ball Pokémon", stealing and eating their precious food. It plays many different tricks, and even Ash and his friends constantly end up falling for its traps. At the end, something unbelievable happens. What’s the most horrible Togepi’s most horrible trick?
Ash, Barry and Brock enters the Twinleaf Festival's main event, a battle tournament. The winner is offered a chance to battle Palmer of the Sinnoh Battle Frontier. Ash wins the tournament and battles Palmer. Palmer choses his Rhyperior and Ash choses Grotle. Palmer comes up with his strategies and almosts defeats Grotle. However, even when Grotle activates Overgrow, Rhyperior defeats it. Ash is awarded the trophy for winning the Twinleaf Town Battle Tournament. Ash and friends say bye to Palmer and Barry and leave Twinleaf Town to go to Lilypad Town for Dawn's next Pokémon Contest and after to Ash's final Gym Challenge in Sunyshore City, Ash's last Gym challenge.
While they are helping with the festival, the group encounters Barry again. To test the progress of each other, Ash and Barry immediately start a battle. However, Barry runs off into the forest and comes across a wild Natu. Soon Ash, Dawn and Barry find themselves in trouble facing predicaments that they each faced in the beginning of their journeys. With Dawn and Piplup up against yet another swarm of wild Ariados and Ash and Pikachu up against a flock of wild Spearow, what will be the outcome of all of this?
As the Twinleaf Town Festival continues, Ash and friends are surprised when they find that one of the upcoming Pokémon courses is to be hosted by none other than Professor Oak. Trouble starts brewing, however, when James brings back an old plan: to disguise himself as the professor. The real Professor Oak goes out and finds that some Quagsire and a Politoed caught him. But later, Brock's Croagunk battles Politoed and wins that eventually releases Professor Oak. Professor Oak gives the Lombre a Water Stone to evolve.