Cosmoem is a Pokémon in the shape of a translucent, dark blue orb with a starscape pattern set in a solid golden shell structure, which is made up of four ellipses intersecting each other in an asterisk shape and another intersecting the former four along the middle. At the center of the main body is a much smaller black core with a blue and a pink marking on the front and an orange semicircle on both sides, giving it the appearance of a sleeping face. The shape also looks like an eye.
It does not, and cannot, move. In Pokémon Refresh, it cannot eat. It grows as it absorbs light. Its body is warm. In ancient times, it was worshiped by the people of Alola.