How do get across the marvelous bridge in Pokemon black 2?

In Pokémon Black 2, to cross the Marvelous Bridge, you need to have completed the main storyline up to a certain point. After defeating the Elite Four and becoming the Champion, you can access the bridge located between Route 12 and Route 13. Make sure you have the necessary Pokémon and items to battle any trainers you encounter along the way. Enjoy the scenic views and the battles as you make your way across!