IGN.com / 21.05.26

The Pokémon Company Considers Government ID Check to Combat Trading Card Scalping in Japan

The Pokémon Company announced today that it is considering introducing an ID verification system in Japan to tackle scalping and cheating related to Pokémon Trading Card Game products and events. The system will utilize Japans My Number card, a government-issued social security card.
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Other sources

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  Polygon.com 21.05.26

  Some Pokémon fans will need a government-issued ID to buy cards now
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  GamesRadar.com 21.05.26

  Pokemon might soon require government ID in Japan to prevent TCG scalping