This card in particular that’s worth a small fortune is called the “Pokémon Super Secret Battle No. 1 Trainer.”
Why is it so valuable?
There were only 7 of them ever made.
In 1999, there were a series of top-secret tournaments that were so protected from the public, the players didn’t even know where their next tournament would be held until after they had won the regional one.
Each winner of the regional tournaments received one of the seven Pokémon Super Secret Battle No. 1 Trainer cards.
Here’s exactly how much this card is worth and why.