Where do you go when have seven gym badges in soul silver?

After obtaining seven gym badges in Pokémon SoulSilver, you need to head to Indigo Plateau, located in Victory Road.

Here's how to get there:

1. Route 47: You'll need to take the Victory Road entrance that's south of Goldenrod City. This entrance is just west of the Goldenrod Department Store.

2. Victory Road: You'll encounter several trainers and wild Pokémon on this challenging route.

3. Indigo Plateau: You'll find the Indigo Plateau at the end of Victory Road, marked by a large, imposing entrance.

Once you reach the Indigo Plateau, you'll face the Elite Four, the final challenge before facing the Champion, Lance.