Ash Ketchum, a ten-year-old boy from Pallet Town, wakes up late on the day he is supposed to receive his first Pokémon from Professor Oak. In a rush, he quickly gets dressed and runs to the lab, but by the time he arrives, all the starter Pokémon--Bulbasaur, Charmander, and Squirtle--have been taken by other trainers. Professor Oak offers Ash a Pikachu, a small, electric-type Pokémon, which Ash reluctantly accepts.

Ash and Pikachu do not initially get along. Pikachu refuses to enter its Poké Ball and is uncooperative, leading to a rocky start to their relationship. As Ash sets out on his journey to become a Pokémon Master, he encounters a flock of Spearow. When Ash tries to catch one, he inadvertently angers the entire flock. The Spearow chase Ash and Pikachu, leading to a frantic escape. In a moment of desperation, Ash protects Pikachu from the attacking Spearow, and Pikachu, moved by Ash's bravery, unleashes a powerful Thunderbolt, scattering the Spearow and saving them both.

After this incident, Ash and Pikachu bond and become friends. They continue their journey and soon meet Misty, a Water-type Pokémon trainer and the Cerulean City Gym Leader. Misty initially confronts Ash because he accidentally damages her bike while trying to catch a Pokémon. Ash promises to pay her back, and Misty decides to join him on his journey, hoping to get her bike fixed.

As they travel together, Ash and Misty encounter various Pokémon and trainers, including Team Rocket--Jessie, James, and Meowth--who attempt to steal Pikachu. Team Rocket's plans are thwarted multiple times, showcasing their comedic yet villainous nature. Ash also meets Brock, a Rock-type Pokémon trainer and the Pewter City Gym Leader, who joins their group after Ash defeats him in a Gym battle. Brock is motivated by his desire to become a Pokémon Breeder and is often seen cooking for the group and providing guidance.

The trio travels through various regions, battling Gym Leaders to earn badges. They face off against Gym Leaders like Brock, who uses his Onix and Geodude, and Misty, who uses her Starmie and Staryu. Ash's determination and growth as a trainer are highlighted through these battles, as he learns to strategize and work with Pikachu and his other Pokémon.

As they continue their journey, they encounter the Pokémon League, where trainers compete for the title of Pokémon Champion. Ash and his friends face numerous challenges, including battling Team Rocket, who consistently try to steal Pokémon and disrupt their journey. They also meet other trainers, such as Gary Oak, Ash's rival and Professor Oak's grandson, who often taunts Ash about his progress.

The climax of the season occurs at the Indigo Plateau, where Ash competes in the Pokémon League. He battles several trainers, showcasing his growth and the bond he has developed with his Pokémon. In the final rounds, Ash faces off against powerful opponents, including a trainer named Richie, who has a strong bond with his Pokémon as well. The battles are intense, with Ash using strategy and teamwork to overcome challenges.

Ultimately, Ash's journey in the Indigo League culminates in a bittersweet moment. He does not win the championship but learns valuable lessons about friendship, perseverance, and the importance of his Pokémon. The season ends with Ash and his friends looking forward to new adventures, setting the stage for future journeys and challenges in the Pokémon world.

At the end of Pokémon Season 1, titled "Indigo League," Ash Ketchum competes in the Indigo Plateau Conference, where he battles against various trainers. Ultimately, he faces off against Gary Oak, his rival, and other strong competitors. Although Ash does not win the championship, he gains valuable experience and strengthens his bond with his Pokémon. The season concludes with Ash and his friends, Misty and Brock, reflecting on their journey and looking forward to new adventures.

As the Indigo League Championship reaches its climax, the atmosphere is electric with anticipation. The arena is filled with cheering fans, and the stage is set for the final battles. Ash Ketchum stands confidently, ready to prove himself as a Pokémon Trainer. He has faced numerous challenges throughout his journey, and now he is on the brink of achieving his dream.

In the first round of the tournament, Ash battles against a skilled trainer named Ritchie. The battle is intense, showcasing Ash's strategic thinking and the strong bond he shares with his Pokémon, particularly Pikachu. The two trainers exchange powerful moves, and the crowd is on the edge of their seats. However, despite Ash's best efforts, Ritchie emerges victorious, sending Ash to the sidelines.

As Ash watches the remaining battles unfold, he reflects on his journey, the friendships he has formed, and the lessons he has learned. Misty and Brock, his loyal companions, stand by his side, offering encouragement and support. They remind him that the experience gained and the bonds formed are just as important as winning.

In the semi-finals, Ritchie faces off against Gary Oak, Ash's long-time rival. The battle is fierce, with both trainers showcasing their skills and strategies. Gary, confident and determined, ultimately defeats Ritchie, advancing to the finals. Ash watches with a mix of admiration and rivalry, knowing that he has yet to face Gary in a battle of his own.

The final match pits Gary against Ash. The tension is palpable as the two trainers prepare for their showdown. Ash calls upon his strongest Pokémon, including Charizard and Pikachu, while Gary relies on his well-trained team. The battle is a spectacle, filled with powerful moves and clever tactics. However, despite Ash's determination and the support of his friends, Gary proves to be a formidable opponent. In a climactic moment, Ash's Pokémon give it their all, but ultimately, Gary secures the victory.

As the championship concludes, Ash stands on the battlefield, exhausted but proud. He may not have won the title, but he has gained invaluable experience and a deeper understanding of what it means to be a Pokémon Trainer. Misty and Brock rush to his side, celebrating their journey together and the growth they have all experienced.

The season wraps up with Ash, Misty, and Brock walking away from the arena, discussing their next adventures. Ash expresses his determination to continue training and to one day become a Pokémon Master. The trio shares a moment of camaraderie, looking forward to the challenges that lie ahead, knowing that their friendship and experiences will guide them on their journey.

As the screen fades to black, viewers are left with a sense of hope and excitement for the future, as Ash and his friends prepare to embark on new adventures in the world of Pokémon.

In the first season of Pokémon, titled "Indigo League," there are no post-credit scenes following the episodes. Each episode typically concludes with a brief recap or a teaser for the next episode, but they do not feature additional scenes after the credits. The focus remains on the adventures of Ash Ketchum, Pikachu, and their friends as they journey through the Kanto region, capturing Pokémon and competing in battles. The episodes wrap up with a sense of anticipation for the next adventure, but they do not include any extra content after the credits.

In the Viridian Forest, Ash catches a Caterpie, which later evolves into Metapod and then into Butterfree.

Ash's first rival in the Indigo League is Gary Oak, who is the grandson of Professor Oak.

The first Gym Leader Ash battles is Brock, who specializes in Rock-type Pokémon.

Misty primarily trains Water-type Pokémon, with her main Pokémon being Starmie and Psyduck.

Team Rocket's motto in the Indigo League is a signature introduction they perform, which includes the lines 'To protect the world from devastation...' and 'Jessie! James!'

In the first season of Pokémon, titled "Indigo League," there are several scenes and aspects that may be considered potentially objectionable or upsetting for children or sensitive viewers. Here are a few examples:

1. Battles and Conflicts: Pokémon battles can sometimes be intense, with Pokémon getting injured or fainting. The competitive nature of these battles may be distressing for some viewers.

2. Team Rocket's Antics: The trio of Team Rocket--Jessie, James, and Meowth--often engage in schemes that involve stealing Pokémon. Their plans can lead to confrontations that may be perceived as threatening or dangerous.

3. Emotional Moments: There are scenes where Pokémon are separated from their trainers or face challenges that evoke feelings of sadness or loss, which might be upsetting for younger viewers.

4. Mild Frightening Elements: Some Pokémon, like Gyarados or Haunter, may appear intimidating or frightening due to their designs and the situations they are involved in.

5. Rivalries: The competitive nature of Ash's journey includes rivalries that can lead to moments of tension and conflict, which may be unsettling for some viewers.

These elements are presented in a way that is generally suitable for children, but sensitivity to these themes can vary among viewers.