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Metal One Horn has one of the fastest attack rates in the game, but has very slow movement speed and pitiful range. He is a mid-tier Metal enemy; while his sizable bulk and rapid attack rate makes him a tough foe for players without any reliable Critical Hitters, his low range, speed and health allow most Critical Hitters to make quick work of him. He also tends to appear in non-Metal stages, forcing you to bring a Critical Hitter and waste a valuable slot on a unit that will most likely not help you outside of the Metal One Horn.
Metal One Horn can demolish your units with his extremely high DPS, more than most other enemies encountered around the time he is introduced, with, for example, 150% of the DPS of a R.Ost. If he gets too close for comfort, it is recommended to send out Puppetmaster Cat and Showoff Cat, which can slow and stop his movement, respectively. Banner Cat won't help that much, as his DPS is incredibly high even when weakened.
One Horn-kun underwent remodeling surgery in order to help more people. He can intercept telephone lines and dispatch before reporting, but he still never makes it on time because he's so slow on his feet.