>>33175709Cosmic is a type with huge physical and special power but shit accuracy in general, as meteors and cosmic phenomena happen rarely. Risk-taking offensive.
Cosmic is super effective against Dragon because meteor extinction.
You know how Flying is immune to Ground? Cosmic is immune to Flying and Ground for the same reason, just one level higher.
Cosmic is weak to Ice and Fire, as these weather extremes are usual in space. Cosmic is also weak to Psychic, because Physics can read cosmic movements/achieve Nirvana/figure out astronomy/whatever
Bug resists Cosmic because many bugs can survive in space for long periods of time, unlike mammals.
We could make some interesting relations of Cosmic with Dark and with Steel based on the infinite darkness of the universe and our technology/space exploration. This depending on what the meta requires.
Mons like Starmie, Beheeyem, Minior, Deoxys, Dialga, Palkia, Giratina, Solgaleo, Lunala, Cosmog, Gothitelle, Clefairy, Solrock, Lunatone, Jirachi, etc and their families can become Cosmic. There are many moves with a Cosmic theme too and items, buildings, evil teams, plot stories, dex descriptions that show us the Pokémon world heavily relies on space as a theme.