Custom Robo (カスタム ロボ Kasutamu Robo?) is a robot fighting game. It was released in 1999 for the Nintendo 64 only in Japan, and in 2006 for the iQue Player only in China. It is the first title of the Custom Robo series.
Source: Wikipedia, "Custom Robo (Nintendo 64)", available under the CC-BY-SA License.