The Mountaintop is located far above the Garmon Mine District in Harvest Moon: Animal Parade. In order to access the mountaintop, you must climb the 45 floors of the Upper Garmon Mine. The Harvest King lives on top of the mountain. You must speak to the Harvest King once you've reached the "Hero" title and rung all five bells in order to finish the main story. Once you have unlocked the Harvest King, he will create a shortcut that makes it easy to access the top of the mountain. This makes it easy to come and speak to the Harvest King at any point.