Ash, May, Brock, and Max are traveling through the Hoenn region when they arrive at a rocky area known for its Onix population. They are excited to see the Onix, which are large rock-type Pokémon resembling serpents. As they explore, they come across a group of trainers who are fishing for Onix using a special bait. The trainers explain that they are trying to catch a particularly large Onix that has been causing trouble in the area.

While observing the fishing techniques, Ash becomes intrigued and decides he wants to catch an Onix for himself. May, on the other hand, is more interested in the beauty of the Onix and wants to take pictures of them. Brock, as usual, is focused on the culinary aspects and thinks about how he could cook with Onix meat, which leads to a humorous exchange among the group.

As they set up to fish for Onix, Ash and his friends learn that the Onix are very elusive and require specific techniques to catch. They witness a trainer successfully catch a smaller Onix, which excites Ash even more. He becomes determined to catch one, believing it will be a great addition to his team. Max, however, expresses concern about the ethics of catching such a powerful Pokémon, suggesting they should respect the Onix and their habitat.

The group splits up to try different fishing spots. Ash uses his fishing rod, while May takes pictures of the Onix swimming in the water. Brock tries to attract the Onix with food. After several attempts, Ash finally feels a tug on his line and excitedly reels in what he believes to be an Onix. However, to his surprise, it turns out to be a large rock instead. This moment is both humorous and frustrating for Ash, who is eager to prove himself.

As the day progresses, they encounter a massive Onix that is causing chaos in the area. The Onix is angry and seems to be protecting its territory. The trainers around them panic, and Ash realizes that this is the Onix everyone has been talking about. He decides that instead of catching it, they should try to calm it down. Ash and his friends work together to devise a plan to soothe the Onix.

Brock suggests using a combination of Pokémon moves to create a distraction while Ash approaches the Onix. They send out Pikachu and other Pokémon to create a friendly atmosphere. Ash bravely steps forward, calling out to the Onix, trying to show that they mean no harm. The Onix, initially aggressive, begins to calm down as it senses Ash's sincerity.

In a pivotal moment, Ash reaches out to the Onix, and it responds positively. The Onix allows Ash to touch it, and the tension in the air dissipates. The trainers around them are amazed at Ash's ability to connect with the Onix. This moment solidifies Ash's belief in the bond between trainers and Pokémon, emphasizing respect over conquest.

After calming the Onix, Ash and his friends decide to leave it in peace, realizing that some Pokémon are better left in their natural habitat. They take a group photo with the Onix in the background, capturing the moment of harmony. The episode concludes with Ash feeling fulfilled, having learned the importance of understanding and respecting Pokémon rather than just capturing them. The group continues their journey, excited for the adventures that lie ahead.

In the ending of "Hooked on Onix," Ash and his friends manage to rescue an Onix that has been caught in a trap set by Team Rocket. After a series of battles and challenges, they successfully free the Onix, which then helps them defeat Team Rocket. The episode concludes with Ash and his friends continuing their journey, having learned the importance of teamwork and compassion for Pokémon.

As the episode nears its conclusion, the scene shifts to a rocky area where Ash, May, Brock, and Max are exploring. They come across a distressed Onix, trapped in a net set by Team Rocket. The Onix struggles, its massive body thrashing against the restraints, creating a sense of urgency and concern among the group. Ash, feeling a strong connection to the Pokémon, immediately decides they must help it.

Brock, with his knowledge of Pokémon care, suggests they need to be careful not to hurt the Onix while trying to free it. May and Max express their worry about Team Rocket, who they know are likely nearby, plotting their next move. The tension builds as they hear Team Rocket's familiar motto echoing in the distance, signaling their approach.

As Team Rocket arrives, they attempt to capture the Onix for their own nefarious purposes. A battle ensues, with Ash commanding his Pokémon to fend off Team Rocket. Pikachu unleashes a powerful Thunderbolt, but Team Rocket counters with their own Pokémon. The fight is intense, showcasing Ash's determination and strategic thinking as he coordinates with his friends to distract Team Rocket while they work to free the Onix.

In a pivotal moment, Ash and his friends manage to distract Team Rocket long enough for Brock to cut the net with a well-aimed attack from his Pokémon. The Onix, now free, roars in gratitude and turns its attention to Team Rocket. With a powerful Rock Throw, the Onix sends Team Rocket blasting off again, their plans thwarted once more.

As the dust settles, the Onix expresses its appreciation to Ash and his friends. There's a moment of connection, where Ash kneels down, looking into the Onix's eyes, conveying a sense of mutual respect and understanding. The Onix then slithers away into the rocky terrain, leaving Ash and his friends with a sense of accomplishment and relief.

The episode wraps up with Ash, May, Brock, and Max reflecting on their adventure. They discuss the importance of helping Pokémon in need and the bonds they share with them. Ash feels proud of their teamwork and the successful rescue, reinforcing the theme of friendship and compassion that runs throughout their journey. As they continue on their path, the group is filled with renewed energy and determination, ready for whatever challenges lie ahead.

In the episode "Hooked on Onix" from Pokémon's season 8, there is no post-credit scene. The episode concludes without any additional content after the credits roll. The focus remains on the main storyline and character development throughout the episode, with no extra scenes or humorous moments added after the main narrative ends.

Team Rocket attempts to interfere by devising a plan to steal the Onix that Ash and his friends are trying to catch. They use their usual antics, including disguises and traps, to create chaos during the competition, showcasing their determination to capture Pokémon for their own gain.

During the Onix-catching competition, Ash faces several challenges, including the fierce competition from other trainers, the unpredictable nature of the Onix, and the need to strategize effectively to catch one. He must also deal with the emotional stakes of wanting to prove himself and support his friends.

Brock plays a significant role as he provides guidance and support to Ash, sharing his knowledge about Onix and helping him strategize for the competition. His experience as a Pokémon breeder also adds depth to the team's approach, emphasizing the importance of understanding Pokémon behavior.

May contributes to the team's efforts by using her skills as a Pokémon Coordinator to help Ash refine his catching techniques. She encourages him and provides emotional support, showcasing her growth as a trainer and her commitment to helping her friends succeed.

The Onix that Ash ultimately catches is significant as it represents not only a personal victory for him in the competition but also symbolizes his growth as a trainer. Catching the Onix reinforces his bond with his Pokémon and highlights the themes of perseverance and teamwork throughout the episode.

The episode "Hooked on Onix" from Pokémon's season 8, titled "Advanced Battle," is generally considered family-friendly. However, there are a few elements that might be slightly concerning for very young or sensitive viewers:

1. Conflict and Rivalry: The episode features competitive elements, including rivalries between trainers, which may lead to moments of tension or frustration.

2. Emotional Upset: Characters experience disappointment and frustration when things do not go as planned, which could resonate with children who are sensitive to emotional struggles.

3. Mild Peril: There are scenes involving Pokémon battles that may depict mild peril or danger, as trainers and their Pokémon face challenges in the wild.

Overall, while the episode contains some competitive and emotional moments, it remains within the bounds of a family-friendly narrative typical of the Pokémon series.