"The latest rumors emanating from the factories of Hamelin surround a battle tank known as the Porco Grosso. This leaked image--depicting the tank's designers, the Porco twins, standing next to their creation--is the only evidence of its existence. The Porco Grosso is believed to be capable of scaling vertical walls and attacking an entire battalion of enemy troops with a single volley."
-The Wizard's Companion (pg. 147)
It is a reference to another Studio Ghibli film, Porco Rosso.
Elemental Resistance: Physical
Elemental Weakness: Storm
Tricks: Porco Salvo (multiple hits to a single target), Road Hog (ram attack--avoid being caught in the path), Hog Roast (fan attack), Gammon Cannon (Damages a single target with one attack)