Comparing a card you’re thinking about buying to a legitimate card is the easiest way to check if the card is fake. The PkmnCards is an excellent resource as it contains hundreds of pictures of confirmed legitimate cards for you to run your checks. Look for any variances in font, printing quality, colors, symbols, and all design elements on the card.
If you’re still unsure, take the card to be authenticated by a trained professional. Bleecker Trading offers this service, meaning we can quickly help you determine if a card is fake.