After several adventures, Ash, his friends, and Cheryl the treasure hunter are finally closing in on the elusive Amber Castle. They've spotted their first Combee Walls, clusters of Combee that surely indicate the Amber Castle and its trove of Enchanted Honey can't be far away. Cheryl's Mothim uses its keen sense of smell to lead everyone towards the scent of honey, and soon they're deep in a series of tunnels. But Team Rocket has found the tunnels too, and when they start digging for honey, the Combee become angry at all the intruders, including our heroes!
Cheryl's Mothim uses Supersonic to confuse the Combee, letting our heroes ignored Team Rocket and continue the search for the Enchanted Honey. They find themselves in front of the biggest Combee yet, and pass through to discover the Amber Castle behind it. This glimmering golden structure has a Vespiquen living at its center, and Cheryl apologizes to it for the intrusion.
Just as Cheryl asks Vespiquen for the gift of honey, Team Rocket bursts into the Castle and nearly wrecks it in their attempt to raid the Enchanted Honey. While Ash and his friends rush to repair the damage, Vespiquen and Cheryl's Mothim deal with Team Rocket, sending them flying before they can do any more damage. After some repairs, the Amber Castle is safe, and Cheryl receives a gift of Enchanted Honey for helping Vespiquen and the Combee. It's time for this treasure hunter to be on her way, and Ash and his friends are also eager to head for their next destination: Eterna City, where Ash's next Gym battle awaits!
After discovering a field of Pomeg flowers thanks to Mothim, Cheryl and the group also spot a Combee. They decide to follow after the Tiny Bee Pokémon, hoping it will lead to the Amber Castle. The Combee whizzes passed them, but Cheryl says that the Pomeg flowers are a sign they’re close. Later, Mothim spots something and suddenly a large wall of Combee flies out of a bush. The group give chase, and they end up near a waterfall with many Combee walls around. Mothim flies off towards the waterfall, and Pikachu excitedly follows across some rocks. On closer inspection, the group notice a cave behind the waterfall, and decide that the Amber Castle must be there. Team Rocket, meanwhile, come out from underneath a rock, deciding to follow after the twerps.
Pikachu and Mothim beckon down one of the cave's passages. Pikachu sniffs the air, and Brock mentions that Pikachu must be able to smell the honey. Pikachu and Mothim race off down the tunnel, with Ash and friends following behind. In the darkest depths of the cave, the group can't decide which way to go. Pikachu calls out to them and the group comes across a large cavern going down, with blue light coming from it. Putting their faith in Mothim’s senses, the group follow the spiral path around the edge of the cavern. Suddenly Mothim flies into a tunnel in the wall, and Pikachu worriedly runs after him. The group start to follow, but lose them. Ash tries to run after them, but Brock stops him, reminding him that they need to stay together. They pick a path and follow it, only to reach a dead end. Jessie and James are becoming increasingly tired from the search for the Amber Castle, but Meowth replies that he has been smelling Honey since they entered the cave. He gives them a motivational speech, making them start digging.
Pikachu and Mothim eventually return to Ash and the others. Pikachu looks worried, as a large group of angry Combee fly past. They decide to follow and find Team Rocket and their holes. A silhouette hisses and the Combee angrily surround Team Rocket. Brock comments that their digging must have made the Combee angry. Team Rocket call out Seviper and Cacnea. Cacnea uses Pin Missile and Seviper uses Poison Tail to attack the Combee. The silhouette hisses again, and the Combee counter with glowing beams of light. Cheryl tells Mothim to use Supersonic to stop the attacks, and Dawn sends out Piplup, which uses Whirlpool, washing Team Rocket away. The group try another path.
They are following another path when it suddenly gets very dark. Mothim seems excited, so they keep going, but Ash walks into a wall, which seems to be moving. They realize that it is a giant Combee wall, and the Combee start attacking them. Mothim uses Supersonic and the wall crumbles, revealing the Amber Castle. They enter the Castle to find honey flowing everywhere. The silhouette is revealed to be the hive’s queen, a Vespiquen, which Dawn scans on her Pokédex. Cheryl walks up to the Vespiquen with a jar in hand to ask for some Enchanted Honey. She is immediately surrounded by angry Combee. She apologizes for forcing her way into the Amber Castle, saying that her dream was to find it.
Suddenly, Team Rocket breaks through the roof of the Castle and perform their motto. Determined to make off with the honey, Team Rocket calls on Seviper, Cacnea and Carnivine and orders them to use Poison Tail, Pin Missile and Bullet Seed respectively. Ash initially starts to battle, but Brock stops him, fearing he might destroy the Amber Castle. Instead, the Combee attack again, but when the attacks stop, the Castle starts to crack. The honey starts to leak, so Team Rocket start loading buckets with honey. Dawn sends out Buneary, which uses Ice Beam to seal the cracks in the walls. Though Brock points out that it is only a temporary fix, as the ice will quickly melt. Brock sends out Sudowoodo and Croagunk to pile up rocks to cover the cracks. Dawn sends out Pachirisu, which uses Sweet Kiss to confuse Team Rocket's Pokémon. The ice starts to melt, so Team Rocket decide to leave, but are stopped by Mothim's Supersonic, surrounded by Combee and attacked with more energy beams. Meowth quickly pulls out an umbrella, which Team Rocket hides behind. However Vespiquen uses Power Gem, sending Team Rocket blasting off through several floors of the cave.
The Combee have calmed down, and they start using the honey to seal the cracks in the walls. Brock thanks his Pokémon. Vespiquen flies up and hands Cheryl a jar of Enchanted Honey, fulfilling Cheryl's treasure quest. Cheryl thanks Vespiquen and then gives everyone a taste of the Enchanted Honey. Everyone appreciates the sweetness, except Croagunk.
That evening the group walk to a clearing in Eterna Forest when Brock starts to flirt with Cheryl again. However she spots a Beedrill, and runs off, claiming that, according to her grandfather, seeing a Beedrill is a sign she should travel alone. As the group head off for Eterna City, Team Rocket is running through the forest chased by a large swarm of Pokémon, as their clothes were covered in the Enchanted Honey when they blasted off.