If you pay attention to Avalugg's measurements, we can simplify his volume to that of a hemisphere with a radius of its height, which would give us a maximum density (since a more precise volume would only be larger, thus reducing the density) of ~29.8kg/m-cubed (speaking of which, random fact: one cubic meter per person is the annual global production of concrete, rather less than I might have expected); since its Pokédex entry states that its body is merely covered in ice (which we will assume is hexagonal ice I, or common ice), which has a density of 917kg/m-cubed, and further simplifying its biological body's density as ~1000kg/m-cubed or that of liquid water (the body's main component) at standard pressure and temperature (potentially problematic, seeing as it maintains an integument of ice), we should be able to calculate the thickness of said ice coat by calculating the necessary radius of its simplified hemispherical body... which comes out to a *maximum* of negative 4.4m. Clearly we have a problem here.