The Pikachu/Eevee Mini Card File could be purchased online from October 27th 2018 as part of the collaboration between The Pokémon Company & The Munch: A Retrospective art exhibition. It includes a Full Art Mimikyu promo.
2018 Japanese Munch: A Retrospective Pikachu/Eevee Mini Card File
@PokemonCenturyadded May 3, 2019
The Pokémon Compamy