- Nyac City is a fictional place in the Pokemon games. It is a large city located in the Sinnoh region. It is known for its modern architecture and bustling streets. Nyac City is home to many important buildings and landmarks, including the Pokemon Center, the Department Store, and the Contest Hall. It is also the location of the Gym where players can challenge the Gym Leader to earn a Badge. Overall, Nyac City is a vibrant and lively city that offers many opportunities for trainers and visitors.