there was two guys really hard on paper mario
the master and a black shy guy (no name)
the master was quite hard because you had to be at the right skill level and have the right items to beat him
the black shy guy does a whole crap of damage to you enough to kill you in one shot, so you need an attack badge and defense badge but since you don't have to beat him and once you do he gives you the attack badge it is pretty useless