I think this would be cool if each starter had an analogue member of a legendary trio that the Pokedex entries tie together. Not an evolution, but a relationship in concept.
We could have a Fire, Water, Grass trio based on a Frog, Hedgehog/Chipmunk, and Fox respectively. Then there could be info about the Fire Frog protecting Froakie from grass, etc. --- Not changing this sig until we get a new main series Tales game released on a Nintendo console in the US