{{Dex/NE|[[Pokémon Brilliant Diamond and Shining Pearl|Brilliant Diamond, Shining Pearl]], and [[Pokémon Legends: Arceus|Legends: Arceus]]}}
{{Dex/NE|[[Pokémon Brilliant Diamond and Shining Pearl|Brilliant Diamond, Shining Pearl]], and [[Pokémon Legends: Arceus|Legends: Arceus]]}}
{{Dex/Entry1|v=Sword|t=FFF|entry=The absorption of starlight fuels this Pokémon's growth. The shell that encases it is harder than any known material.{{tt|*|Pokédex entry only found in Pokémon HOME.}}}}
{{Dex/Entry1|v=Sword|t=FFF|entry=The absorption of starlight fuels this Pokémon's growth. The shell that encases it is harder than any known material.{{tt|*|Pokédex entry only found in Pokémon HOME.}}}}
{{Dex/Entry1|v=Shield|entry=It sucks in dust from the air at an astounding rate, frantically building up energy within its core as preparation for evolution.{{tt|*|Pokédex entry only found in Pokémon HOME.}}}}
{{Dex/Entry1|v=Shield|t=FFF|entry=It sucks in dust from the air at an astounding rate, frantically building up energy within its core as preparation for evolution.{{tt|*|Pokédex entry only found in Pokémon HOME.}}}}
Cosmoem is a Pokémon in the shape of a translucent, dark-blue orb with a starscape pattern set in a golden shell-like structure. The main portion of the shell is a flat oval around the center of the orb. Eight more flat, half-oval projections surround the orb in an asterisk-shape. At the center of the main body is a much smaller black core. The upper half of the core has a thin blue line on the front, back, and each side, while the lower has pink lines. On the front are two orange semicircles, which appear to be closed eyes. The overall shape of this Pokémon also resembles an eye. When evolving, the Pokémon glows either an orange or a purple color, correlating to Solgaleo and Lunala respectively, gaining traits of either a stylized sun or a stylized moon.
Encased in its sturdy, cocoon-like shell, Cosmoem is unable to move. In Pokémon Refresh, it cannot even eat. It grows as it absorbs starlight and the dust in the air. Its body is warm to the touch. Cosmoem's shell is said to be harder than any known material. In the ancient times, it was known as "The cocoon of the stars" by the people of Alola.
Cosmoem is one of the shortest Pokémon in existence. Despite this, it is also the heaviest Pokémon in existence, being tied with Celesteela. Cosmoem's height in the Pokédex is actually measured by it's width, rather than its height, as seen in its concept art.
Cosmoem is also the smallest of all Legendary Pokémon, and tied with Celesteela for the heaviest of all Pokémon.
With its pre-evolved form weighing in at 0.1 kg (0.2 lbs.) and Cosmoem at 999.9 kg (2204.4 lbs.), the evolution from Cosmog to Cosmoem is the largest increase in weight due to evolution, with an increase of 999,800%.
Cosmoem also loses the most weight out of any Pokémon upon evolution when it evolves into Lunala (120.0 kg at (264.6 lbs.)) , who weighs 879.9 kilograms less than Cosmoem.
Cosmoem and its pre-evolved form, Cosmog, are the only Pokémon who are unable to damage an opponent outside of Struggle.
Cosmoem's evolution from Cosmog has the greatest standard deviation of all Pokémon, with 47.14, meaning that the changes to its base stats on evolving are the most uneven out of all Pokémon.
Cosmoem has the fewest learnable moves out of all evolved Pokémon, with only three moves that it can learn.
Cosmoem has the highest Special Defense of all Pokémon that can still evolve.
Origin
Cosmoem has characteristics of both a stylized sun and a stylized moon, having rays and a pair of crescents, respectively. Its enormous weight despite its extremely small size shares similarities with super-compressed astronomical bodies such as black holes and neutron stars. Given its description, it seems to be an embodiment of star formation in general. It may also be based on the idea of the world egg. When viewed from the front, its shape resembles an eye.
Name origin
Cosmoem may be a combination of cosmo, ovum (Latin for egg), and embryo.
This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.