Plot: Medabots AX: Metabee version and Medabots AX: Rokusho version are spin-off fighting games of the Medabots series, developed and published by Natsume. Metabots AX was never released in Japan, instead an almost identical version called Medarot G was released. Wikipedia
Plot: Medabots: Metabee and Medabots: Rokusho is a set of two 2D top-down role-playing video games in the Medabots series, developed and published by Natsume for Game Boy Advance. It is a remake of the Japan-exclusive title Medarot 2, which was released for the Game Boy Color in 1999. Wikipedia
Plot: Brave Prove is a 1998 Japanese video game for the PlayStation. It was developed by Data West Corporation, and directed by Noburo Nishizawa. It is a 2D action role-playing game with real time combat and top-down perspective. Wikipedia
Plot: 70's Robot Anime Geppy-X is a 1999 Japanese video game released for the Sony PlayStation console. Developed and published by Aroma, it is a horizontally scrolling shooter set in a world that is an homage to mecha anime of the 1970s. Wikipedia