Why was Sigilyph, a Pokemon based on the Nazca Lines in Peru, introduced in the generation 5 games?

Question

I have done a little bit of research and have found the Blythe Intaglios in California, which are similar to the Nazca Lines in Peru. Could this be a good reason as to why Sigilyph was introduced?

Comments

Kachina dolls: https://en.wikipedia.org/wiki/Kachina

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does there have to be a reason that it was introduced in generation 5 specifically?

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I think this counts as a game freak logic question.

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Cough! Opinion/discussion questions are not allowed! Cough!

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All I know Unova was based off the USA and the Americas