PokéBase - Pokémon Q&A
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Also other such Pokemon, like Chansey.

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Yes but no. The pokemon will still go into the evolution screen, but it will stop, and the pokemon won't evolve. After etting the national dex, they will.

http://www.serebii.net/red_green/evolution.shtml

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This was fixed in new generations though, so don't worry about this now. It's Dex number will just be question marks.