"Pokémon This Gym of Mine" is a fan-made game developed using the RPG Maker XP software. Players take on the role of a custom gym leader, creating and customizing their gyms to challenge others. The game offers unique features like gym and leader customization, an original soundtrack, and an engaging story.

Players get to experience a different perspective by stepping into the shoes of a gym leader rather than a Pokémon trainer. The game's focus on gym creation and battling adds a fresh twist to the traditional Pokémon gameplay, providing a unique and immersive experience for players.