The reason for the special attacks is that they bypasses Intimidate, making Swampert an answer to Landorus with Ice Beam. Swampert is on your team to handle bigtime threats in Aegislash, Landorus-T, Mawile, Talonflame, Bisharp, Zapdos, Heatran, and Thundurus. And for Wide Guard.
It seems silly I know, but you'll be surprised at the kills that it nets.