Here's why:
* It's part of the Pokemon Trading Card Game: Pokemon Trainer cards are essential components of the game, just like Pokemon and Energy cards.
* It has a physical card form: It's printed on a standard card stock, with artwork, text, and card information.
* It has a specific function in the game: Trainer cards provide unique effects that can affect the game's strategy, like drawing more cards, healing Pokemon, or disrupting your opponent's actions.
So, in the context of the Pokemon Trading Card Game, a Pokemon Trainer card is definitely a card!