All Weather Rocks in Pokémon Platinum (Icy, Smooth, Heat, and Damp Rocks) - Guide Strats
Secret Key (Sinnoh) - Bulbapedia, the community-driven Pokémon encyclopedia
Dr. Lava on X: "Pokemon Gen 4 contained a key item never made available to fans -- the Azure Flute, which would have granted access to the Hall of Origin and a