Answer:
In the 3rd Gen games Crunch is a Special Attack as well as Crabhammer. All moves in 3rd Gen are determined by their their Type, unlike 4th Gen where moves are all different according to whether they should be physical or special. For example, Crunch is a Special Attack like Shadow Ball is a Physical Attack. Judging by those examples, all Dark attacks (Crunch, Bite, Faint Attack, etc.) will be Special Attacks and all Ghost attacks (Shadow Ball, Shadow Punch, Lick, etc.) will be Physical Attacks. Another example is Crabhammer, which you may figure would be a Physical Attack since Kingler will be attacking with his crab claw, but it is in fact a Special Attack because of it's Water element in 3rd Gen. In 4th Gen however, Crabhammer is a Physical Attack.