This is epic! But the way I see it, he kind of looks like he's the terrible teenager who hasn't cleaned his room and his parents are telling him off, so he is trying to reason with them! Mum: "Aggron, have you cleaned your room today son?" Aggron: " Yeah yeah I'll clean it in a minute! Argh! Parents!" XD
Indeed he's cool, I have both the original and the Shiny version of him. I always watch out for Water because of the Rock-Water weakness, but it's Fighting-types that hurt him the most for both Steel and Rock, Fight quadruples the damage.