Sophocles is out camping with his parents and Pokémon at Bamboo Hill when he finds a strange metallic object buried in the ground. Remembering a folktale, he believes it to be the legendary spaceship Celestial Starship. The next day, after he tells his classmates about it, they go there and see it for themselves. After an unsuccessful attempt to dig it up, they return to school, where they are contacted by Lusamine about an Ultra Beast having been detected. Sophocles is surprised to discover that the Pokémon he discovered is a Celesteela, and they determine to return it home. Attempts to catch it in a Beast Ball prove unsuccessful as it is firmly rooted down. Team Rocket attempts to catch Celesteela as the Ultra Guardians try to protect it, and Team Rocket is almost incinerated as Celesteela begins to launch itself. After the Ultra Guardians create a safe launch area, they watch Celesteela fly home.