By the way Charak, I suggest you try and save yourself some work and do a copy and paste for general sections.

Like Pokemon found in every Grassland/Body of water/Cave/etc. regardless of route to have their own sections. These would usually feature something like Magikarp, Goldeen, Zigzagoon, Pidgey, and so on though. Just to get the really common ones out of the way.

And then you can save the more major encounters for route specific.