Motionless as if dead, its body is faintly warm to the touch. In the distant past, it was called the cocoon of the stars.
– Pokémon Sun Pokédex
Cosmoem is the evolution of Cosmog, and it evolves into Solgaleo or Lunala, depending on the game. It’s considered a legendary Pokemon, but unique in that it can evolve. It evolves from Cosmog at level 43, and evolves again at level 53
Cosmoem only learns 2 moves, Teleport and Cosmic Power. It cannot learn any damaging moves.
It’s the heaviest Pokemon, weighing 999.9 kg (2204.4 lbs), tied with Celesteela. Yes, a tiny Cosmoem weighs more than Primal Groudon (though only by 0.2 kg). It is also tied with Joltik, Flabébé, Cutiefly, and Comfey for the smallest Pokemon, at 0.1 m (4 inches).
Stat-wise, it has very high defenses, but very low Attack, Sp Attack, and Speed. But I guess it doesn’t really matter since it can’t learn any attacking moves anyway, it’s not meant for battling.