Punchbag Bob is the training punching bag of the Battledome. Through Punchbag Bob does not fight back, he does have 5000 HP that must be taken away from him. Beating Punchbag Bob will earn you a trophy. Punchbag Bob has a brother known as Punchbag Sid.
There is a Punchbag Bob avatar. To get it, you simply lose to Punchbag Sid when he randomly appears and replaces Bob as a challenger.