There are 4 (four) Pokemon that are confirmed to have been created in ancient times:
Did the creation of Baltoy and Claydol in ancient Hoenn inspire people in ancient Unova to create Golett and Golurk? Is this merely a case of coincidence?
It's likely that these Pokemon appeared exclusively in the regions in which they were created (Baltoy/Claydol in Hoenn, Bronzor/Bronzong, and Golett/Golurk in Unova) until people started traveling to other regions and bringing those Pokemon with them (which was probably much later on), so my above theories of one Pokemon line's creation inspiring the other line's creation seems unlikely and pure coincidence seems to be the strongest answer thus far, unless there is further information on this matter that I have not been made aware of.
Added Later:
There are 2 (two) Pokemon that are unconfirmed (but are highly likely) to have been created by humans in ancient times:
Source: http://bulbanews.bulbagarden.net/wiki/On_the_Origin_of_Species:_Bronzor_and_Bronzong
What does Pokebeach think about these six Pokemon?
Baltoy and Claydol:
Source: http://bulbapedia.bulbagarden.net/wiki/Artificial_Pok%C3%A9mon"Many Pokédex entries of Claydol state that it and its pre-evolution, Baltoy, were originally clay figures created by ancient people. The figures came to life after being exposed to mystical rays."
Golett and Golurk:
Source: http://bulbapedia.bulbagarden.net/wiki/Artificial_Pok%C3%A9mon"Golett and Golurk were apparently created by an ancient civilization to protect people and Pokémon alike."
Did the creation of Baltoy and Claydol in ancient Hoenn inspire people in ancient Unova to create Golett and Golurk? Is this merely a case of coincidence?
It's likely that these Pokemon appeared exclusively in the regions in which they were created (Baltoy/Claydol in Hoenn, Bronzor/Bronzong, and Golett/Golurk in Unova) until people started traveling to other regions and bringing those Pokemon with them (which was probably much later on), so my above theories of one Pokemon line's creation inspiring the other line's creation seems unlikely and pure coincidence seems to be the strongest answer thus far, unless there is further information on this matter that I have not been made aware of.
Added Later:
There are 2 (two) Pokemon that are unconfirmed (but are highly likely) to have been created by humans in ancient times:
Bronzor and Bronzong:
Bronzor and Bronzong are said to be man-made Pokemon because of correlations between them and ancient Asian myths surrounding mirrors and bells that supposedly had mystical powers.Source: http://bulbanews.bulbagarden.net/wiki/On_the_Origin_of_Species:_Bronzor_and_Bronzong
What does Pokebeach think about these six Pokemon?