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Avalugg is a massive Pokémon seemingly formed entirely out of reflective ice. Its top half is flat, with three cracks, one before its stubby tail and two in between its four legs. These legs are cylindrical, and also sport purple cracks at its joints and in between its icy toes. Underneath each toe is a spike, similar to cleats. Large icicles hang from its underside, which nearly touch the ground. Avalugg's head is similar to its body, a cracked wedge of ice with a flattened upper surface. Its mouth has a large underbite, which opens up to reveal four small teeth and purple gums. The head has two white diamond-shaped "ears," and from its chin hangs three bulging spikes, resembling a beard.
Bergmite are known to huddle on top of Avalugg's back, causing it to resemble an aircraft carrier made out of ice. Its cumbersome frame is as hard as steel, able to crush anything that stands in its way.