>>28257680Cosmic Pokemon are almost exclusively Psychic now. It's a pseudo-retcon if you ask me, although, Unknown, Lunatone and Solrock and others reflect tradition more so than retcon.
In a space themed region we would find an abundance of Psychic, Fairy, Rock, Ice, Steel, and Fire Pokemon. Cosmic is a great idea but I feel that because everything in space shouldn't actually be labeled by environment like most Water and Ice types are unfortunately. Desert Pokemon aren't exclusively Ground/Rock/Steel but that trinity offers a good amount of design variations. And in that same line of thought, if you want a space Pokemon game that isn't completely monotonous, leave the idea of Cosmic type in the past. In that same sense a type based not on a core energy or element would make more sense.
Fanmade space fakemon are mostly Psychic/Rock or rather Rock/Psychic (cosmic themed Psychics seem to be sub-types)