What If All Pokémon Were a Single Type? (Kalos + Megas!)

Even Pokémon from the third dimension aren't immune to the idea of what they might be like if they all had just a single type! However Kalos was a fairly small region, so we'll be including all the Gen 6 Megas as well (because they gotta go somewhere!) So what will the smallest Pokemon roster look like if we they never had the idea for dual types...