An internet search makes me guess that they are just Japanese Nintendo Pokémon playing cards, in decks of 52. The package appears to have evolved over time and they appear to still be made today, in newer versions that is. That, is my theory. See here and here, see how the packages change...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.