From Bronzong's bulbedia page:
Origin: Bronzong is based on a dōtaku, Japanese bells which were believed to have been used to pray for good harvests. They are often decorated with patterns representing nature and were buried, occasionally with bronze mirrors and weapons, in isolated locations. Bronzong and the fact that it evolves from Bronzor also seems to be based on an old Japanese myth present in the book Kwaidan: Stories and Studies of Strange Things by Lafcadio Hearn. The priests of Mugenyama wanted to forge a bell for their temple, so they asked the local women to donate their bronze mirrors for this purpose. A woman contributed her mirror, but later regretted it. Because of her repentance, the mirror wouldn't melt in the furnace until she killed herself. Before her suicide, she said that whoever would break the bell would be given great wealth by her ghost. A multitude of people tried to break the bell by ringing it furiously, so the tired priests managed to roll it down a hill into a swamp. Additionally, Bronzong's facial features resemble those of the Mesoamerican rain god Tlaloc, who is often depicted as being predominantly cyan in color. In Mexico City, which is located on the site of the former capital of the Aztec empire, artifacts are often discovered during construction-related excavation, which Bronzong's Pokédex entry in Pokémon Diamond may reference.
