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I don't see them changing up the Water/Grass/Fire starter tradition anytime soon seeing as they've done it so long. But with the other elemental triangle (Fighting / Flying / Ice ) in mind I wouldn't mind seeing dual-type files with both elemental triangles going. Kind of like Sinnoh where the Pokemon with an advantage of the next type would have the disadvantage going the other way (Sinnoh didn't completely do that but close enough). So it would be a Fire/Fighting (which, if they did this I wouldn't mind really), Grass/Flying, and Water/Ice.