The Butterfly Ship is a flying ship owned by Princess Scarlet. She is using it to visit Papillia once a month for her three-day visits to all of her royal subjects there. It is not known by the Fillys where the ship arrives from, and the Ship can fly high up in the skies. Its main docking station in Papillia is on the center of Papillia's big main lake.
On occasions, Princess Scarlet invites every one of her friends to a big dance onboard the Ship, where the guests has prepared something special and surprising to occur at the dance.