You are entirely right about Unova being based on New York.
Most Japanese dragons are water deities associated with rainfall and bodies of water, and are typically depicted as large, wingless, serpentine creatures with clawed feet.
In regards to Unovas dragons, they are certainly more Western than Eastern.
RE: Unova is modeled after New York. The Relic Castle consists of two, broken towers. The Ghost type Yamask and Cofhagrigus can be found inside. Yamask is said to be a human soul that remembers when it was alive, carries a mask that used to be its face, and cries over being dead. And now, it haunts The Relic Castle, which, as stated earlier, consists of two broken, burned down towers, in a fictional region based off of New York. Let that sink in for a second.
Its evolution Cofhagrigus is no better- it eats humans and turns them into mummies like Yamask. Now you know how these guys reproduce!
And you can breed them!
To make things a little clearer, Route 4 and Resort Desert are said to be Ground Zero.
That's why Yamask & Cofhagrigus horrify me!