The misprint is the mark on the top right of the card. This is not a stain, it occurred during the printing process.

The Charmander Base Set (Shadowless) 46/102 Common Pokémon card is a sought-after collectible for fans of the Pokémon Trading Card Game. This card features the iconic Charmander character from the Base Set (Shadowless) series, making it a valuable addition to any collection. As a common card, it is more easily obtained compared to rarer cards, and its popularity among players and collectors alike ensures its continued demand in the market.