The episode begins with Ash and his friends, including Pikachu, Lillie, Kiawe, Mallow, and Sophocles, gathered at the Pokémon School. They are discussing the recent events surrounding the Ultra Beasts and the mysterious Ultra Wormholes. The atmosphere is tense as they reflect on the challenges they have faced and the looming threat of the Ultra Beasts. Ash expresses his determination to protect Alola and his friends, while Lillie shows concern for her brother, Gladion, who has been involved in the conflict with the Ultra Beasts.

As they converse, a sudden disturbance occurs when a portal opens, and an Ultra Beast, Nihilego, emerges. The group quickly realizes that Nihilego is not alone; it is accompanied by a powerful figure, Lusamine, who has been corrupted by the Ultra Beast's influence. Lusamine's demeanor is cold and commanding, and she reveals her intention to capture the Ultra Beasts to harness their power. The friends are shocked to see her in this state, as they had previously known her as a caring mother and the head of the Aether Foundation.

The scene shifts to a confrontation between Ash's group and Lusamine. Ash, fueled by his desire to save Lusamine and protect his friends, steps forward to challenge her. He calls upon Pikachu to battle Nihilego, but the Ultra Beast proves to be a formidable opponent. The battle is intense, with Pikachu using Thunderbolt and other moves to try to weaken Nihilego. However, Lusamine commands Nihilego with precision, and it retaliates with powerful attacks that put Pikachu in danger.

As the battle rages on, Lillie is torn between her loyalty to her friends and her desire to save her mother. She recalls the moments they shared and the love she has for Lusamine, which fuels her determination to reach out to her mother. Lillie steps forward, calling out to Lusamine, trying to remind her of the bond they once had. This emotional plea momentarily distracts Lusamine, allowing Ash and Pikachu to regroup and strategize.

In a pivotal moment, Lillie uses her bond with her Pokémon, Snowy, to create a distraction. She urges Snowy to use Ice Shard to freeze Nihilego temporarily. This gives Ash the opening he needs to launch a powerful attack with Pikachu. They combine their efforts, and with a well-timed Thunderbolt, they manage to weaken Nihilego significantly. However, Lusamine, still under the influence of Nihilego, becomes enraged and commands it to unleash a devastating attack.

The scene escalates as the battle reaches its climax. Ash and his friends work together, coordinating their Pokémon to fend off Nihilego's attacks. Kiawe uses his Fire-type Pokémon to create a barrier of flames, while Mallow and Sophocles provide support with their own Pokémon. The teamwork showcases their growth as trainers and friends, but the situation remains dire as Lusamine becomes more aggressive.

In a moment of clarity, Lusamine begins to struggle against Nihilego's control. Lillie seizes this opportunity and rushes to her mother, reaching out to her emotionally. She expresses her love and desire to have her mother back, which resonates deeply with Lusamine. The internal conflict within Lusamine becomes evident as she fights against Nihilego's influence. This emotional struggle culminates in a powerful moment where Lusamine finally breaks free from Nihilego's grasp.

With Lusamine regaining her senses, she realizes the chaos that has ensued. She apologizes to Lillie and the group, acknowledging the pain she has caused. The bond between mother and daughter is rekindled, and Lillie embraces Lusamine, tears of relief streaming down her face. The group stands united, witnessing this heartfelt reunion.

As the episode nears its conclusion, Nihilego, now without its master, becomes agitated and prepares to attack once more. However, Lusamine, now fully aware of her actions, steps in front of her children and friends, determined to protect them. She uses her knowledge of Ultra Beasts to communicate with Nihilego, attempting to calm it down. The scene is tense as the group watches, unsure of what will happen next.

In a surprising turn, Lusamine successfully reaches out to Nihilego, and it begins to retreat, recognizing her authority. The portal opens once again, and Nihilego, along with the other Ultra Beasts, begins to disappear back into the Ultra Wormhole. The group watches as the threat dissipates, feeling a mix of relief and sadness for the creatures they have encountered.

The episode concludes with Ash and his friends reflecting on the events that transpired. They express their gratitude for Lusamine's return and the strength of their bonds. Lillie feels a renewed sense of hope for her family, while Ash reaffirms his commitment to protect Alola and his friends. The screen fades out as they stand together, united in their resolve to face whatever challenges lie ahead.

In the ending of "The Prism Between Light and Darkness!", Ash and his friends confront the powerful Ultra Beast, Nihilego, and the threat it poses. They work together to save their friend Lusamine, who has been consumed by Nihilego's influence. After a fierce battle, Ash and his Pokémon manage to free Lusamine from Nihilego's grasp. The episode concludes with the group reflecting on their experiences and the bonds they have strengthened through their trials.

As the episode draws to a close, the scene opens with Ash, Pikachu, and their friends standing in the aftermath of the intense confrontation with Nihilego. The air is thick with tension, and the remnants of the battle linger around them. Nihilego, a shimmering, otherworldly creature, looms ominously, its form pulsating with a mix of light and darkness. The stakes are high, as Lusamine, the head of the Aether Foundation, is trapped within Nihilego's grasp, her consciousness flickering between reality and the abyss.

Ash, fueled by determination and a sense of urgency, steps forward, his heart racing. He knows that saving Lusamine is paramount, not just for her sake but for the safety of everyone involved. His friends, including Mallow, Lana, and Kiawe, rally around him, their expressions a mix of fear and resolve. They understand the gravity of the situation and the emotional turmoil Lusamine has been through, having been consumed by her own ambitions and the darkness of Nihilego.

The battle begins in earnest, with Ash commanding Pikachu to unleash a powerful Thunderbolt. The electric energy crackles through the air, illuminating the darkened surroundings. Nihilego retaliates, its tendrils striking out with a menacing speed. The friends work in unison, coordinating their Pokémon to create a strategy that can counter Nihilego's overwhelming power. Mallow's Tsareena and Kiawe's Turtonator join the fray, each attack resonating with the hope of freeing Lusamine.

As the battle rages on, the emotional stakes rise. Lusamine's voice echoes through the chaos, pleading for help, her vulnerability stark against the backdrop of the fierce confrontation. Ash's resolve strengthens; he recalls the moments they shared, the kindness she showed to Pokémon, and the love she has for her children, Gladion and Lillie. This fuels his determination to save her, not just as a trainer but as a friend.

In a climactic moment, Ash and his friends combine their efforts, channeling their Pokémon's strength into a final, desperate attack. The scene is filled with vibrant colors as light and darkness clash, creating a stunning visual spectacle. With a powerful burst of energy, they manage to break through Nihilego's defenses, freeing Lusamine from its grasp. She collapses to the ground, exhausted but safe, her eyes filled with gratitude and relief.

As the dust settles, the group gathers around Lusamine, their expressions a mix of joy and concern. Ash, with a reassuring smile, helps her to her feet. The emotional weight of the moment is palpable; they have not only saved Lusamine but have also reinforced their bonds as friends and allies. Lusamine expresses her heartfelt thanks, acknowledging the mistakes she made and the darkness she allowed to consume her. This moment of vulnerability marks a turning point for her character, as she begins to understand the importance of connection and support.

The episode concludes with a reflective scene, where Ash and his friends stand together, looking out over the horizon. They share a moment of camaraderie, recognizing the strength they found in each other during the battle. Each character's fate is intertwined; Ash continues his journey as a Pokémon trainer, emboldened by the experience. Lusamine, now free from Nihilego's influence, vows to change her ways and focus on the well-being of her family and the Pokémon she cares for. The bonds forged in battle serve as a reminder of the light that can emerge from darkness, leaving the audience with a sense of hope and unity.

In the episode "The Prism Between Light and Darkness!" from Pokémon's season 21, there is indeed a post-credit scene. After the main events of the episode conclude, the scene shifts to a serene setting where Ash and his friends are enjoying a peaceful moment. They are gathered together, reflecting on their recent adventures and the challenges they faced.

As they share laughter and camaraderie, the atmosphere is light and filled with a sense of accomplishment. The camera pans to show the beautiful landscape of Alola, with its vibrant colors and lush greenery, emphasizing the bond between the characters and their Pokémon.

In this moment, Pikachu playfully interacts with the other Pokémon, showcasing their friendship and the joy of their journey together. The scene encapsulates the themes of unity and resilience that are central to the series, leaving viewers with a warm feeling as the episode wraps up. The post-credit scene serves as a reminder of the importance of friendship and the adventures that lie ahead for Ash and his companions.

In 'The Prism Between Light and Darkness!', Necrozma is a central figure, representing a powerful force that has absorbed light from Alola, causing chaos and darkness. The episode explores Necrozma's motivations and its connection to the Ultra Beasts, as well as its desire to reclaim its lost light.

Ash and his friends, including Pikachu, work together to understand Necrozma's plight. They devise a plan to restore its light by using the power of the Ultra Guardians and the bonds they share with their Pokémon, showcasing their determination to help even a creature that poses a threat.

The Ultra Wormhole serves as a gateway to the Ultra Dimension, where Necrozma originates. In this episode, it becomes a crucial plot device as Ash and his friends navigate through it to confront Necrozma and attempt to restore balance to their world.

In this episode, Lillie's bond with Nebby deepens as she realizes the importance of her Pokémon's role in the battle against Necrozma. Her emotional connection drives her to support Nebby in its transformation, highlighting her growth as a trainer and her commitment to her Pokémon.

Ash and his friends face numerous challenges, including battling Necrozma's overwhelming power and the darkness it brings. They must work together, strategizing and using their Pokémon's abilities to counteract Necrozma's attacks, all while dealing with their own fears and doubts about the outcome.

The episode "The Prism Between Light and Darkness!" from Pokémon's Sun & Moon: Ultra Adventures series is generally considered family-friendly, as is typical for the franchise. However, there are a few elements that might be potentially objectionable or upsetting for some children or sensitive viewers:

1. Dark Themes: The episode explores themes of light versus darkness, which may include moments of tension and conflict that could be intense for younger viewers.

2. Emotional Struggles: Characters experience emotional turmoil and face difficult decisions, which may resonate deeply with some viewers, potentially causing discomfort.

3. Confrontations: There are scenes involving confrontations between characters and Pokémon that may depict conflict or aggression, which could be unsettling for sensitive viewers.

4. Visuals of Darkness: The portrayal of dark forces or entities may be visually striking and could evoke fear or anxiety in some children.

Overall, while the episode maintains a lighthearted tone typical of Pokémon, these elements may require parental guidance for younger audiences.