The first step in determining a card's rarity is to examine the symbol in the bottom-right corner. If the symbol is a black or white star, it signifies that the card is at least a Rare.

Another indicator of rarity is the presence of holographic foil. Certain parts of the card may have a shiny, reflective foil. Holographic cards tend to be more valuable and sought after by collectors.

The condition of a Pokémon card can significantly impact its value. Look for any signs of wear, such as creases, scratches, or faded colors. Cards in mint condition will often command a higher price.

Ultra rare cards may have alternate color variations of the rarity symbol. These variations can include gold, silver, or other unique colors. These alternate color variations often indicate a higher rarity level.

Certain Pokémon cards, particularly those featuring popular Pokémon or limited edition releases, can be worth more due to their desirability. Keep an eye out for cards featuring fan-favorite Pokémon or cards that were only available for a limited time.

Some Pokémon cards may have printing errors that make them more valuable to collectors. One such error is the "shadowless" printing, where the shadow behind the Pokémon's image is missing. These cards are considered rare and sought after by collectors.

Pokémon cards that have limited distribution, such as promotional cards given away at specific events or as prizes, can also be considered rare. These cards may have unique artwork or features that make them highly collectible.

If you're unsure about the rarity of a Pokémon card, consider reaching out to experts or consulting online communities dedicated to Pokémon card collecting. These resources can provide guidance and help you accurately assess a card's rarity and value.