Description taken from Game Boy Color version of this game

Though essentially similar to other collect-and-train Game Boy Color RPGs like Digimon, Monster Rancher, and the ubiquitous Pokémon, the Robopon games strive to offer more customization in character development and more story-driven adventure elements than many of other titles. Players assemble and enhance their Robopon robots from a selection of collectable parts, then send them off to battle. Some Robopon can also be enhanced by directing the signals from ordinary remote control devices at the infrared sensor on the GBC, which can often produce unexpected upgrades. Though this Star Version of the game contains some exclusive Robopon and other features, the storyline and basic gameplay are the same as that of Robopon: Sun Version, released in the US during the 2000 holiday season. ~ T.J. Deci, All Game Guide