 If you liked
Medarot
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 ...then you might like
Pokemon Diamond & Pearl
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Pokemon and Medabots are shounen anime and they pretty much alike. Both anime's are about a boy, who lives alone with his mother, that gets a pokemon/medabot as their partner. They become friends and battle a lot with other people. They wanna become one of the best and to do so they participate into competitions. Both series also got some "bad guys" and they are complete idiots, they always lose in the end.