I'm pretty new here, so please forgive me if this idea has already been suggested, but I believe that it would benefit everyone.
My idea is instituting the Pokemon search feature which appeared in Pokemon X/Y and exists in ΩR/αs.
The basis of this feature is that one is able to search an area for a specific Pokemon which they have already caught.
Now, in X/Y/ΩR/αs, this feature includes a little dancing sprite above where the Pokemon is in the grass;
I do not believe that this is necessary and it would be much easier to just narrow the Pokemon able to be encountered in the area to that Pokemon which has been selected.
Why is this important? How would this affect the community?
This would make it much easier to obtain shiny Pokemon because of the ability to form chains.
Additionally it would make the PVP scene more accessible to more people because this feature would help people more easily find Pokemon with the best IVs/Natures.