Shadowless Pokmon cards are a valuable subset of the Pokmon Trading Card Game (TCG) that were printed without a drop shadow behind the artwork. They were only produced during the first print run of the Base Set in 1999 and are highly sought after by collectors.
There are a few key ways to tell if a Pokmon card is shadowless. First, look at the copyright date on the bottom of the card. Shadowless cards will have a copyright date of 1999, while later printings will have a copyright date of 2000 or later. Second, look at the border around the card. Shadowless cards will have a thin black border, while later printings will have a thicker black border. Finally, look at the artwork on the card. Shadowless cards will have a more vibrant and detailed artwork, while later printings will have a more muted and less detailed artwork.