In the 22nd century, Medarots--intelligent robots powered by medals that act as their minds--are commonplace all over the world. They serve their human partners and settle disputes through a combat sporting event known as Robattling. Combatants that take part in robattling for the sake of improving their ranking are known as Meda-fighters, and they aim to climb the ranks to enter the World Tournament and represent their country. (myanimelist.net)