Pokemon X and Y were developed by more than 500 people, director Junichi Masuda revealed on his Game Freak blog, the Hidden Power of Masuda.
He began the post describing how Pokemon X and Y's worldwide October release was a "dream come true" and the result of years of development.
"It took three and a half years to develop this game," Masuda wrote. "Taking into account the localization groups for each language, more than five hundred people were involved in the development."
He also explained the reasoning behind the letters in the names.
"The letters ‘X' and ‘Y' suggest lines on an axis. The lines of both letters head in different directions, but there's a point at which they cross, or intersect. I used the letters with the idea of intersection in mind; the idea of the common points we share with one another, rather than our differences.
"'Let's create a better world together!'
"I developed this game to communicate this idea."
For more on the game, you can read and watch Polygon's Pokemon X and Y review, which called the latest installment the "renovation this series has deserved for over a decade."