‘Medabots’

Set in the near future, the series revolves around the super-charged battling adventures of a group of kids and their unique, high performance pet robots, Medabots. Fueled with A.I. and a specialized arsenal of unique weapons, Medabots compete against each other in exciting Robattles, with the winners acuiring Medaparts from the defeated Medabot. In this high-tech world, every kid hopes the successful outcome of their playground challenges and backyard Robattles will give them the opportunity to represent their country at the World Robattle Tournament held every four years

Descriptions taken from AniDB.net