Skullmet

Skullmet (スカルメット) is an enemy that appears in Skull Man's stage in Mega Man 4 and Mega Man III. On one side it looks like a skull and the other side has a one eye. To destroy it, Mega Man must shoot it in the eye (charged shot is best). The Rain Flush attack will destroy it in several hits despite where Mega Man is standing as long as they're on the same screen.

Trivia

 * Skullmet's name may be a reference to the classic enemy Met.