>>717792617
To clarify >>717793040 point a bit more, a jobber is someone presented as powerful so that the guy who beats him up looks REALLY strong when he wins so that someone else can look really, REALLY strong when they beat the guy who beat the jobber. Vegeta is always presented as Goku's rival but he's never allowed to beat a major villain. Because Goku is supposed to beat the major villain. But if Goku just walks up and wins then you might not realize how super duper strong Goku is, therefore Vegeta exists to get his ass beat, so you have context for how amazing Goku is