March 26, 2016 (Japan) January 30, 2017 (United States)
Japan, United States
The Ditto Collection (Japanese: へんしん！メタモンTransform! Metamon), originally called the Ditto Poké Plush Collection, is a collection of merchandise featuring Ditto, particularly Ditto transformed into other Pokémon, but retaining its own face (like Duplica's Ditto). It was available in Japan starting March 26, 2016 and in the United States on January 30, 2017 via the Pokémon Center online store.
In Japan, it includes both Poké Plushes (ぬいぐるみ plushes) which cost ¥1200, and mascots (マスコット) which cost ¥800. In the United States, it includes Poké Plushes (which cost US$14.99) and Plush Keychains (which cost US$8.99). All three are mostly identical, but the mascots and keychains are smaller and have a loop or keyring (respectively) attached to their head to allow hanging. With the fourth release of plushes, several other kinds of items were added to the collection in Japan. In the United States, a set of pins was added shortly before the fourth wave.
Alongside the fourth wave of plushes on March 25, 2017, the Japanese collection added place mats, cups, bags, hand cream, a phone case, stickers, earrings, t-shirts, and pens. The United States collection added two sets of pins, on May 10 and August 23, 2017, respectively.