The Sinnoh Region of the Pokémon Brilliant Diamond and Pokémon Shining Pearl Games Experience the nostalgic story from the Pokémon Diamond™ and Pokémon Pearl™ games in an adventure reborn on the Nintendo Switch™ system. Adventures in the Pokémon Brilliant Diamond and Pokémon Shining Pearl games will take place in the Sinnoh region. Rich in nature and with Mount Coronet towering at its heart, Sinnoh is a land of many myths passed down through the ages. You’ll visit many different locations in the Sinnoh region, while striving to become the Champion of the Pokémon League.