Share 'Pokemon, Bakugan! Where did they come from?'

Hello Everyone! My son has received some new toys for his birthday from his friends... My older son has also previously received some of them a couple years ago, but didn't seem to interested in it. I don't know anything about it, I don't know where these toys have originated from or what they mean. Does anyone know where they came from? I want to have some solid information about it. I feel...