In Gold, Silver & Crystal, the Bell Tower was called the Tin Tower

The Bell Tower, previously known as the Tin Tower, is the tower in Ecruteak City that is still standing. Long ago, this tower was said to awaken Pokémon in contrast to the Brass Tower. It has numerous levels with various platform puzzles to bypass. At the top, if you have the Rainbow Wing and Clear Bell (in HeartGold), the legendary Ho-Oh shall appear