It depends on the Pokemon you're trying to evolve. While some Pokemon can evolve without any problems due to being in the regional Pokedex, other Pokemon (Golbat, for instance) won't evolve without the National Pokedex. Note that this is only the case in FireRed and LeafGreen - in later games, Pokemon not in the regional Pokedex will evolve, but won't be recorded until you get the National Pokedex.
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There are only two Pokemon(without the National Pokedex).They are Pickachu (into Raichu) and Eevee (into Jolteon).
Once you have completed the pokedex I think you should try and evolve them all and then get them all to level 100 although its impossible to complete the pokedex without an action replay
no not possible or get national pokedex from rowan then migrate, then go to pal park.
the kanto pokedex YES national not sure but i think you have to trade from ruby or sapphire or something
By trading it in from elsewhere, eevee is not available in the main Diamond/Pearl game before the national pokedex. When you have the national dex, however, you just go to see Bebe in Hearthome, in the house right next to the Pokemon center.