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Whether you like the idea of a Cosmic type or not, you must admit that out of all the ideas for a new type, it's the most likely, and the easiest to fit into the game.
We already have a lot of pokémons, items and moves who have a relation with space and celestial body, we already have an evil team base around that concept and the new region is shaped like a star and during last smash announcement every XY news had a night sky background..