It was resess and evryone was talking about there rainbow rare and secret rare Pokemon cards. I did not have any rainbow rare or secret rare Pokemon cards or know what they are.
Added in the Sun and Moon Series, Rainbow Rare cards are some of the hardest, and most expensive, in the game. They only appear in certain times and some can sell for hundreds or thousands of dollars.
Each set has a number of cards attached to it. You can see the number usually in the bottom left of the card. Secret Rares, however, go beyond that number. For instance, if you have a card that reads “115/113,” it’s a Secret Rare. Secret Rare cards can look different with the more recent Rainbow Rare variety also being put into this category. You can always tell a Secret Rare from the number, though, and they’re the most expensive cards.
Each set has a number of cards attached to it. You can see the number usually in the bottom left of the card. Secret Rares, however, go beyond that number. For instance, if you have a card that reads “115/113,” it’s a Secret Rare.
Secret Rare cards can look different with the more recent Rainbow Rare variety also being put into this category. You can always tell a Secret Rare from the number, though, and they’re the most expensive cards.
Source
Hope I helped!