First edition Pokemon cards are highly valuable due to their limited availability and historical significance. These cards were among the earliest prints of Pokemon cards and often fetch high prices in the collectors' market.

Shadowless Pokemon cards are extremely rare, and their value reflects that. These cards lack the shadow border typically found on the right side of the card's artwork, making them highly sought after by collectors.

Holographic and rare promotional Pokemon cards, such as those given out at events or included in special merchandise, often hold significant value. These limited edition cards are highly desirable among collectors and fans.

Professional card grading services evaluate the condition and authenticity of Pokemon cards and assign them a numeric grade. A higher graded card, such as a PSA 10, can command a much higher price than the same card in lower grades.