From Bulbapedia, the community-driven Pokémon encyclopedia.
Mt. Moon Square (Japanese: おつきみやま ひろば Mt. Otsukimi Square) is a small area in Kanto that can only be found in Gold, Silver, Crystal, HeartGold and SoulSilver. It is located in the heights of Mt. Moon where very few people venture. For adventurers who stumble across the square, there is a small shop that sells a variety of goods and a small, square field where Clefairy are said to perform secret rituals.
Mt. Moon Square sits atop the heights of Mt. Moon where very few people venture. The area is small and intended, with rugged mountains surrounding the square at all angles, almost like a crater hit the place. There are two entrances into the square; one from the north end and another from the southern side. On the eastern side there is a small shop, where adventurers who stumble across the square can buy a variety of goods. On the western side there is a strange, mysterious square where Clefairy are said to preform secret rituals.
A small shop in the square is open everyday from 10:00 AM to 5:59 PM. It's there for adventurers who stumble across the secret square. The shops sells a variety of goods, including Portrait Mail, which can only be found at the shop.
In addition to a shop, there is a small, square field next to the shop. If the player ventures to the square between Monday night at 8:00 PM and Tuesday morning at 4:00 AM, the player will see two Clefairy dancing around a rock. Once the player enters the square, the Clefairy will be startled and run away, leaving behind Kanto's only smashable rock, which hides a Moon Stone. However, if the player leaves the area (or enters the shop) before smashing the rock, the rock will disappear and there will be no way to get it back until the following Monday.
In Generation IV, there will be four Clefairy dancing around a pond with the moon's reflection, with two Clefairy standing aside watching. During the dance, a Clefairy will see the player and all the Clefairy will run away, leaving behind an item ball with a Moon Stone inside.
Top panel: The Clefairy dancing; Bottom panel: after they have left
The Clefairy dancing at Mt. Moon Square in HeartGold and SoulSilver
- In G/S/C, there were two Clefairy dancing at the square. In HeartGold and SoulSilver, the number of Clefairy increased to four. This may be a reference to the Generations where Johto has taken place: Generation II and IV.
- Despite the full moon being visible only about once a month in the real world, its reflection is visible here every Monday.