Im in b2,i have 6 badges and the yellow man from the E4 will not let me enter Twist Mountain. What do I have to do ?
In B/W 2, you don't have access to Twist Mountain until after the Elite Four. You need to travel by plane in Mistralton City, which will take you to Lentimas Town. The seventh badge is in Opelucid City from Drayden.