By inhaling a Metalun or its larger counterpart, Kirby becomes hard, rough, and impervious to nearly everything. The only downside is that Kirby moves very slow and his flight is also greatly hindered. But just walking into enemies inflicts steady damage to them, without taking any himself. In terms of design and abilities, Metal is comparable to the Kirby 64: The Crystal ShardsDouble Stone Combo Ability.
Attacks and Features
Kirby ground pounds. This is Metal Kirby's only mean of damaging bosses.
Kirby transforms into a sphere. As a metal ball, Kirby rolls down hills and rams enemies & mid-bosses all the while. Only usable after the Metal Scroll is found.
The Stone ability doesn't appear in Squeak Squad because this ability is very similar and supposedly superior to its counterpart.