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Wizards of the Coast should execute on that idea more readily

There are three main companies to choose from if you want to get your Pokemon cards graded professionally: PSA (Professional Sports Authenticator founded 1991 -) PSA GRADING STANDARDS BGS (Beckett Grading Services founded 1984 -began card grading in 1991) BGS GRADING STANDARDS CGC Trading Cards (Certified Guaranty Company founded 2000 -began card grading in 2020) CGC TRADING CARD GRADING STANDARDS HOW MUCH DO CARD GRADING SERVICES COST

It does however have quite a nice list to get you started (here is the one for Pikachu)

Why exactly this mechanic didn't get the success that it possibly could've is a bit harder to figure out, but it could be because most people just simply didn't care when there's so few cards that use it, and none of which being particularly powerful enough to leave a mark on the game