How do you get to indigo plateau in Pokemon ash gray and officer jenny is blocking me?

In Pokémon Ash Gray, you need to defeat the Elite Four and Champion to access the Indigo Plateau. If Officer Jenny is blocking your way, ensure that you have completed all necessary requirements, such as defeating all gym leaders and the Pokémon League challenges. Additionally, make sure you’ve progressed far enough in the storyline, as certain events must be completed for her to allow you through. If you’re still stuck, check for any side quests or items you may have missed that could help advance the story.