Blurring the lines

Pokemon and humans. What's the difference? Is it their appearance? Their intelligence? But ones thing's for sure, no human can stand up to a pokemon in a fight. And most pokemon can't see an unfair deal if it hit 'em in the face. Well at least that was before a pink haired girl fell out of the sky and said to every pokemon. "Let's form a contract?" And suddenly pokemon had a voice.