What kinds of stuff would you change, not for better move sets, stats or anything gameplay-wise that just makes sense?

What Pokemon are not in the right egg group?
What Pokemon are found in terrible places?
What Pokemon should be found in specific places and are not?
What Pokemon should be related but are not?
What Pokemon should have evolutions or prevolutions and still do not have them?

Let's hear it /vp/, we're not building a new game or fixing any existing games, just want to hear what you think makes sense.

To start, Tauros and Miltank should have a shared pre-evolution.