Legendz is online with full episodes to watch of the anime series with English subtitles.  Legendz also known as Legendz: Tale of the Dragon Kings is about monsters, dragons and the whole lot. Legendz begins with a boy at Ryudo Elementary School. He battles other people who raise and train monsters. He later enters the Legendz Carnival competition, where he learns of an evil that threatens the world.

Though Legendz sounds a bit like Pokemon the main difference is that Legendz deals more with the background of the monster characters and their story.

Watch Legendz Online
Catch full episodes via this link