In FRLG, if you max out a Golbat or Chansey's happiness (example), they will try to evolve. However, they can't... because you don't have the National Dex. What sense does that make?!? Why do you need the National Dex to evolve Pokemon? The Pokemon professors didn't need Pokedexes to discover new Pokemon! Pokemon should be able to undergo evolution without the need of a Pokedex. So why do you need the National Dex to evolve certain Pokemon?