This following should have an EVO:
Shuckle
Aerodactyl
Torkoal
Tropius
Froslass
Kecleon
Miltank
pachirisu
Tauros
No more eevelutions, but maybe some more regis. Like Regiplant, regisky, etc
I don't think these Pokemon need evolution:
Shuckle(The highest Def and Sp. Def, therefore no evolution needed)
Aerodactyl(If it gain more evolution, it will be overpowered)
Torkoal(I don't see why it need an evolution)
Tropius(I don't see why it need an evolution)
Froslass(I don't see why it need an evolution)
Tauros(If it gain more evolution, it will be overpowered)
Miltank(I don't see why it need an evolution)
Only Pachirisu need to gain evolution.
Shuckle(It needs a babylution, Shuckle has the highest Def and Sp. Def, a baby form will lighten up its Def and Sp.Def.)
Aerodactyl(It needs too, but if it gains one, I'm sure it will cause a controversy. Since it is revive from a fossil, so...)
Torkoal(It needs a babylution for some reason.)
Tropius(It needs a pure Grass-type babylution.)
Tauros and Miltank(Tauros and Miltank can share same babylution, but only the right gender will evolve into the right Pokemon.)
I disagree with the eeveelution, I think every type should have the opportunity to gain one.
About the regis-, did you know that ALL regi- are weak to Fighting-type? But Grass-type and/or Flying-type were not weak to Fighting-type, so instead of those types I think a Dark-type would be better...