How to evolve Cosmoem in Cobblemon.
Cosmoem evolves into Solgaleo when it reaches level 53 during the day.
Cosmoem evolves into Lunala when it reaches level 53 at night.
Evolution line
What Cosmoem needs
2 paths
SolgaleoLevel up
Level 53Day
LunalaLevel up
Level 53Night
Moves it learns on evolving
Sunsteel StrikeMoongeist Beam
These are offered the moment the evolution completes. Decline them and you have to relearn them later.
Is it worth it
Cosmoem nowpsychic400
Solgaleopsychicsteel680
Lunalapsychicghost680
Base stat totals, from the Cobblemon 1.7.3 species files.