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Air type. Basically a elemental version of Flying so we can have the four classical elements in the game.
Super Effective against: Fairy, Flying
Weak against: Grass, Poison
Resistant against: Ground, Water
Pokemon that can be retconned: Tornadus, Swablu and Altaria, Castform, Rayquaza, Drifloon and Drifblim, Rotom (fan form), Shaymin (sky form) etc.
In case you're wondering, I did not make it super effective against fire because I tried to make it coherent with the "hierarchy" of the four elements (pic related).