Where is the den in soul silver?

There is no "den" in Pokémon SoulSilver. The term "den" is typically associated with Pokémon Dens in games like Pokémon Sword and Shield, where you can find and battle wild Pokémon.

In SoulSilver, the equivalent of dens are the "Pokémon Centers," where you can heal your Pokémon and buy items.

Perhaps you're thinking of a specific location in the game? If you can provide more context, I can help you pinpoint what you're looking for.