Why is my pokemon card different?

I found this Pokemon card on my way home from school the other day. It's picture and name was mostly scratched off but you could see the rest of the details. It has 450 hp and a 5 card retreat cost, which seemed very odd. It's attack is Power Blow with a 20x damage. Luckily on the bottom of the description for the attack, the card said that the Pokemon's name is Roserade. I looked it up on Google images and found a card that has the same picture and attack and poke-power. But, the hp was only 90 and the retreat cost was 1 card. Despite looking harder and longer, I couldn't find a card with 450 hp or a 5 card retreat cost. The card I found seems legit, it is made of the same card stock, has the proper picture on the back, it even has the copyright for Pokemon/Nintendo on it. So why does this Roserade have such a high hp and retreat cost?