This comes from the Iwata Asks interview...

Makino: I'm Makino from the Software Planning & Development Department. We asked Namco Bandai Studios to develop it, so I first participated as a coordinator. But in the end, I got into just about anything. I mainly worked on the network aspect of the game, but at times I made suggestions on how some features should turn out to be.

Suzuki: I'm Suzuki in the Software Planning & Development Department. At first, I was a coordinator too, serving as contact for Namco Bandai Studio and dealing with overseas subsidiaries in localizing the overseas versions, but eventually, like Makino-san, I was doing anything I could.

Shimamura: From the middle of development, Makino-san and Suzuki-san were also working as full-fledged planners. We did ask Namco Bandai Studio to develop the game this time, but staff in Nintendo's Network Development & Operations Department--the Software Planning & Development Department that these two are in--and EAD also chipped in.

Source: Iwata Asks