Is there such thing as a mistake pokemon card?

Hello, my name is Nataly though it is now 2019, I still play the Pokémon TCG with my girlfriend. We recently went to GameStop to buy cards like we always do. And when we go home, we opened our new decks and got to playing. (We don’t look at the deck, we just shuffle, and play. Try it, it’s fun!) As the game went on it was my turn, I drew a card and I just HAD to stop the game. I said “babe seriously though, I can’t play this card” and she asked “why”. I showered her the card and it was a Basic Skorupi, but when I looked at the Hp...it said “Hp 7000”! This can’t be right! Did GameStop sell me a fake deck? Is this card a mestake? Or did I get lucky and find something rare? I don’t want to say it’s fake because I worked at a GameStop and we don’t see fake Pokémon products! I’m just confused! Can anyone who knows about Pokémon help?