A possible concise summary is:
Rex, a pizza delivery boy, finds a device called the dino tuner that allows him to unite with three dinosaur robots from another planet. They are the dino core, who are fighting against the evil darkness that corrupted their home world. Rex and his friends John and Emily help the dino core train and battle against darkness's mech dinos, while also learning about friendship and trust. Rex also has to deal with his father's pizza business and his rival Lex, who is suspicious of his activities.
Here are the key facts extracted from the text:
1. The text is a transcript of an animated show called Dino Core.
2. The main character is Rex, a boy who becomes the Dino Master with the help of a device called the Dino Tuner.
3. The Dino Tuner allows Rex to unite with three dinosaur robots: Tyranno, Saber and Stego, who came from a planet called Dino Planet.
4. Rex and the Dino Core have to fight against Mech Dinos, who are corrupted by an evil force called Darkness.
5. Rex can use Dino Discs to learn new moves and power up the Dino Core.
6. Rex has two friends, John and Emily, who help him with the Dino Book and the spaceship.
7. Rex also works at his father's pizza delivery business.
8. Rex faces challenges such as mastering the Dino Tuner, gaining the trust of the Dino Core, and balancing his duties and hobbies.