From the Super Mario Wiki
Intelligent Systems is a video game development team of Nintendo. They have created the Paper Mario series and have assisted in developing the WarioWare series, since WarioWare, Inc.: Mega Party Game$!.
They are also the producers of the Fire Emblem series, which was mentioned in Paper Mario: The Thousand-Year Door, and appeared in Super Smash Bros. Melee and Super Smash Bros. Brawl. They have also assisted in making the aforementioned, Super Smash Bros. Melee, and Super Smash Bros. Brawl. Intelligent Systems has also helped Nintendo debug systems. They also helped to develop the Nintendo 3DS Camera application into the handheld system.
Mario games developed