Here's why:
* Tournament Rules: The Pokemon Trading Card Game (TCG) has strict rules about which cards are allowed in tournaments. These rules are designed to ensure fairness and a level playing field for all competitors.
* Card Legality: The Pokemon TCG website and official tournament rules clearly define which sets and cards are considered legal for tournament play. Promo cards are often excluded from these lists.
* Exceptions: While most promos are not legal, there are a few exceptions. Some promotional cards are designed specifically for tournament play and are clearly marked as such. These cards are usually part of a larger set that is tournament legal.
* Check the Rules: It's always best to consult the official Pokemon TCG website and tournament rules for the most up-to-date information on card legality.
Important Note: If you're unsure about a specific promo card, it's best to err on the side of caution and assume it is not tournament legal. This will help avoid any potential issues during a tournament.