How can i get third badge in Pokemon prism?

To obtain the third badge in Pokémon Prism, you need to travel to the town where the third gym is located, which is the Tectonic Gym. Make sure to defeat the gym leader, who specializes in Rock-type Pokémon, by using effective counters like Water, Grass, Fighting, Ground, or Steel types. Additionally, be prepared for any trainers in the gym and ensure your Pokémon are leveled up to handle the challenges. After defeating the gym leader, you'll receive the badge and can continue your journey.