Why do Brock and Misty follow Ash around?
They follow Ash for their own reasons. Misty is following Ash because he destroyed her bike in the first episode, and she is following him around until he gets her a new one. Of course, she’s almost completely forgotten about it, so she’s not sure why she’s following him anyway. Brock is following Ash because it was his first time to travel after caring for his ten brothers and sisters for so long. His father came back to take care of the family while Brock went along with Ash. Brock is out to become a great Pokemon breeder.