Pokémon HeartGold and SoulSilver/Dragon's Den

In the Dragon's Den, after you defeat the 8th Gym leader; Claire you will enter and find that you will be fighting 3 battles, Dragonair x2, and some others. Then you will enter a building--to get there you need whirlpool. Once you get inside you will be asked several questions and then you will see Claire walk in after you have passed. She will give you the 8th gym badge. Then you will leave. Monsters in the Den are; Magicarp, and Dratini.