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The show you're thinking of is Magi Nation, the first episode he has a cross country race and the grandfather gives him a gemstone that contains a creature. The boy ends up getting sent to the Magi Nation becuase hes the dreamer and is getting called there to help. The show used to be on Netflix but got removed now it's nearly impossible to find. Amazon sells a few episodes on dvd, and it might sell the series on a digital copy. By the way how do you do this? Ask people about a show?
Edited by PokeSh6698

Hello! I'm looking for a cartoon that I watched around 2010 (I'm not sure when it aired). In the first episode there was a young boy (around 12) that was having a race and his grandfather gave him a medallion/amulet/gemstone (something like that) for luck. Then as the young boy was running across the forest he stopped for a bit and his medallion "activated", revealing a creature that looks a little bit like Appa from Avatar (it was some kind of a lion or a bear, maybe). I can also remember that he somehow got stuck in another world and the portal between his world and the other one looked like a monument. There was this other episode where he was searching for something with some other people and at first he went through an ice mountain and then he ended up in a samurai temple. That's pretty much all that I could remember, I'd really aprecciate your help!