Old Chateau

Old Chateau is a dungeon in Sinnoh.

Pokémon

 * Gastly
 * Haunter
 * Gengar
 * Rotom (boss)

Catching Rotom unlocks its forms:
 * Rotom (heat) (boss)
 * Rotom (wash) (boss)
 * Rotom (frost) (boss)
 * Rotom (fan) (boss)
 * Rotom (mow) (boss)