Its kinda hard to know where to EV train, when you dont know what pokes can be found in the area you are in. So i suggest something like this.
LET THE PHOTO EVIDENCE IN:
https://s10.postimg.org/qzqqawwqh/screenshot_1475675521.png
You could basically view poke in your pokedex, go to wild locations and press any location you want to see what pokes can be found in that location. It would act pretty much like a filter for a pokedex. Instead of simple search name there would be location too.7
If there was some poke that you havent seen yet, it would show as a ? (QUESTION MARK) like always in the pokedex.
OFF TOPIC: Is there a way to add a picture to this post? I dont really understand how. The guide for adding a picture shows some old GUI for the topic editor.