You are a 10 foot tall Machamp that's trained by a tall man. A tall, strong, and abusive man. You were captured as a Machop and taught quickly to fear your master, who had caught you by beating you with his bare hands. That was so long ago.
As the years passed, you have grown powerful, and so has he. You have grow less afraid of your mater through the time, but you still aren't sure you can take him. Your evolution into a Machamp was recent and he could still take you with his other pokemon while you were a Machoke.
You are sent out to battle a wild Golem, but maybe you can finally claim your freedom instead.