Rocky Mountain Summit
From the Super Mario Wiki, the Mario encyclopedia
Rocky Mountain Summit is a location in Super Mario Odyssey. It is located in the Luncheon Kingdom, at the highest point of the kingdom. The kingdom's Crazy Cap is located here, run by Toads. There is a Toad outside the shop who encourages Mario to go right in and have a look around. There is a Checkpoint Flag in the middle of this area, circled by coins. There is a palm tree with a Power Moon above it. Glydon rests at the edge, and can be captured to reach one of the surrounding islands. Later in the game, Princess Peach and Tiara can also be found here.
Mario can climb up the palm tree to find Power Moon #8, "Enjoying the View of Forgotten Isle". Power Moon #21, "Shopping on Forgotten Isle", can be purchased at the shop, among other items. Talking to Peach and Tiara earns Mario Power Moon #25, "Peach in the Lost Kingdom". Other Power Moons can be collected by using Glydon to reach various spots throughout the kingdom.