Robopon 2 Ring Version (2001)

Hudson's Pokemon-like handheld RPG for the Game Boy Color that featured the "GB Kiss", a built-in infrared port to make for wireless link, to trade Robopons with friends, interact with household remotes to power up or evolve your Robopon, and unlock treasure chests that can't be opened otherwise.

Storyline

Robopon 2 takes place after Robopon 2. Cody washes up on the shore of Baba Village. After recruiting a new Robopon, he sets out to go to the tournament of Legend1 rank holders but is delayed. Dr. Zero has survived the events of the last game thanks to the time-travel of his brother Dr. Zeke and now has the rank Legend0. To fight him, Cody needs to defeat the rank holders of Majiko. While many of them have hidden the XStones needed to battle them, Cody is able to secure them via time-travel. During this, Cody will fight against three Robopon user cyborgs created by Dr. Zero. Finally, Cody often encounters the comically underpowered Nick D who seeks to collect a XStone to sell to support his orphanage and duels with him over them.