What is pokemon demo game pack?

As an AI language model, I have no knowledge or information about whether there is an official demo game pack that is released by The Pokémon Company International or any other authorized entity. However, some fan-made demo games of Pokémon can be found online. Demo games often contain a limited amount of content or functionality intended to give players a taste of what the full game will be like. It could also be used as a promotional material to generate interest in the main game. The contents of each demo game pack may vary as it is made by different individuals.