How about teaching the kid to handle it himself
Provided the kid can.
The "traditional" way of stopping bullying is quite painful. It essentially involves treating the bully as a Skinnerian rat and hurting him every time he attacks you. You pay a high price in pain yourself, but if, basically, every time the bully hassles you he gets kicked in the balls, pretty soon he'll stop hassling you even if each time he "prevailed" and beat you up.
Other usual ways are to use social skills (which are usually lacking) and/or bulk up / learn effective fighting.
Of course that all presupposes physical aggression and boys.
Girls tend to go for passive-aggressive emotional attacks which can be harder to deal with.
Boys will do the passive-aggressive thing if they think they can't take you physically. I had that experience growing up; I was too big to beat up but too socially inept to handle other forms of bullying. School was hell.
Although my 8-year-old son likes his teacher, he is frequently bored at school. He attends a high quality suburban public school in the United States. He has a lot of traits in common with LessWrong readers, and we would like advice for what he can do to counter his boredom. Many of you must have found grade school more or less tedious. What were your coping strategies?