Apart from this article, I dont know anything about playtesting in Pokmon, especially not during the WotC era
SOME OF THE HOTTEST CARDS ARE PIKACHU AND CHARIZARDS, ESPECIALLY EX, GX, AND FULL ART VERSIONS, AND CARDS FROM THE EARLIEST SETS (BASE, JUNGLE, FOSSIL, & TEAM ROCKET)
Luffy Red Super Parallel (OP13-118) is the most valuable at approximately 350,000 (~$2,333 USD) on the Japanese secondary market as of March 2026
Go, Popplio
Print Quality of Collector Boosters Unfortunately, there are significant differences in print quality among new cards from sources such as Collector Boosters or Wizards Promo Packs, which are likely due to the different production locations (Japan, Europe, and the United States)
But, the most important test to detect a counterfeit Magic card is the Green Dot Test Within the green dot on the back of the card, you can find a yellow spot