So one thing I dont like about Pokemon is they introduce evolution items then forget about them in future generations.
In the main games both Nosepass and Magneton evolve when near a Magnetic field in the game. Location based evolution doesnt really work in Pokemon Go so itd be cool if instead of just using 50 and 100 candies you could use the extra Metal Coats you have if you have them.
It would make their evolutions a little more interesting as opposed to Blissey and Crobat who lost the happiness factor in their evolutions.