Pokémon and the online custom shirt brand Original Stitch have collaborated to create customizable masks from Pokémon Shirts, which can be made by combining any combination of Pokémon patterns! You can buy them from Friday, October 30th, 2020 at 12:00. Prices start from 1,800 yen (excluding tax).

You can choose from 151 Pokémon patterns from Pokémon Red and Green on the front of the mask, and four different colors of mesh fabric on the back of the mask. There are two sizes to choose from, S and M, so you can make a matching mask with your family or friends.

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Sources: https://www.pokemon.co.jp/goods/2020/10/201030_ap01.html and https://pokemon.originalstitch.com/mask.html