You’ll need these details:
- Enter the card name. Printed at the top of the card.
- Enter the card number. Printed at the bottom of the card as a fraction.
- Enter holo if the Pokemon image is holographic/shiny… or reverse holo if the frame, not the image, is holographic. If you don’t know, don’t include these words in your search (or watch my video where I explain). Use the checkboxes to pick ones that are comparable to yours. This gives you an accurate estimate of what the Pokemon card is worth.
For example Dragonite 52/108 foil
The card name is printed at the top of the Pokemon card. In this example “M Charizard”.
The card number is printed at the bottom as a fraction. In this example “101/108”. 
Video of me looking up Pokemon cards prices:
If you get too many results that include cards NOT like yours, use the checkboxes to pick the ones just like yours. Choosing a few comparable items by using the checkboxes gives you very accurate estimate of your Pokemon card’s value and the prices you should pay for them.
What to do next:
Once you’ve searched mavin.io and figured out the value of your Pokemon cards, you have several options:
If your Pokemon cards are valuable… You could hold onto the cards and “collect” them, as most collectors do, and hope they appreciate in value over time. It may be a good investment to get them professionally graded by PSA. This will dramatically increase the price they’ll sell for online because it guarantees their authenticity and condition.
You could sell your cards to a local card shop, knowing full well what they sell for online (because you looked up the Pokemon card prices on Mavin.io right?). Remember that dealers purchase collections at wholesale prices. They need to make a profit and selling a large collection takes a considerable amount of time and resources… so don’t expect (or demand) to get 100% of the Pokemon card prices you’d get if you sold them yourself online.
Selling your Pokemon cards online will get you the best price, but it can be time consuming: taking pictures, writing descriptions, responding to customers, packing, shipping, returns… it’s a lot of work. If you have the time and patience, selling them online is a great way to make money. Read our guide to selling on eBay.
If your Pokemon cards worthless… your cards don’t have to be valuable to still be enjoyed. There’s probably a friend, a kid you know, or even a stranger who would love to have them. Give them away to someone who will enjoy them! Or sell them for a fraction of what you originally paid for them by dumping them on Craigslist. If you do give them away to someone who doesn’t play, teach them a game or two so they get the hang of it… or at least print out the instructions/rules for them! Current Pokemon trading card game rulebook.