GameXplain shared that Nintendo is making a special accessory for Pokemon Sun & Moon, which is the Z-Ring. When playing Pokemon Sun & Moon on the 3DS with this synced up to the 3DS, it makes sounds and effects as if you are using the device yourself.
Pokemon Sun & Moon Trailer – Alola Forms & Z-Moves (GameXplain)
GameXplain posted a new trailer for Pokemon Sun & Moon, which Nintendo released today. It covers a lot, like new Pokemon and the special Z-Moves Mechanic.