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Object? 0__0 Aggron is a biped Triceritops.
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I wanted to reply to you on that thread, but sadly it got closed. Too bad, it looked like a fun discussion! ^_^
Anyway, I've personally always felt that Aggron was something of a biological robot. It has Rock and Steel typing, it looks like it's made out of machined parts (particularly the steel bands on its body and the head and mouth parts) and its cry sounds like a distorted train whistle, which is something you'd expect more from a robot than from a dinosaur. Besides that, Aggron starts off as Aron, who looks rather similar (to me, anyway) to those robot puppies that were popular a few years ago.
Of course, there's some great arguments that Aggron is actually a living creature that merely has a body with properties similar to that of rock and steel, and that could very well be what the designers had in mind when they thought of the thing. I just personally class it as a bio-robot, and therefore in the same group as Muk, Klink, Probopass etc. So, yeah. That's what was going through my head when I made that list. n_n