Within a Pokémon evolution family, only the first Pokémon is available from an egg. For example, in the Bulbasaur family - Bulbasaur, Ivysaur, and Venusaur - only Bulbasaur can be hatched from an egg.
But now as generation 2 Pokémon have been introduced, some of those evolve into the generation 1 Pokémon, which are also available from eggs. For instance, Cleffa evolves into Clefairy. Clefairy was able to be hatched before the update, but I don't know now as Clefairy is generation 1 whilst Cleffa is generation 2.
So are those generation 1 species still able to hatch from eggs?