User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-21378804-20131003110715/@comment-4212769-20131003113121

That's a candidate too, but I think Gravios gets the medal, as it is at least as large as Duramboros (if you don't count super-sized Rust Duramboros) and has hard and heavy armor. Duramboros may be big but I think it isn't as heavy as a Gravios.