Added quote due to new page:
Also, I feel the need to say this since saw a few posts from some months ago about it: if you find a card that has a lot of errors on it, don't assume automatically it's rare or valuable. Look up a list of error cards (several sites have compiled them) and see if it is there. If it's not, then the card is a fake. This mostly goes out to the person who said they had a Medicham with 5 errors on it, but also for those who might ask.