I have a number of eggs that I received before the update that added Generation 2 baby Pokémon (e.g. Pichu). Do these eggs have a chance to hatch these Pokémon that were not in the game when I got them?
Pokemon-go – Can Generation 2 Pokémon (e.g. Pichu) hatch from an egg I got before the update that added them
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Related Solutions
Eggs come in three distances: 2km (1.2mi), 5km (3.1mi), and 10km (6.2mi). The distribution of these seems to be relatively random, however 5km seems to be somewhat more common than the others. 10km seems to be somewhat rarer for now, however these numbers have become extremely balanced since the beta.
Pokemon's strength (and rarity) is usually determined by the distance you need to walk to hatch the Egg.
You can get any non-legendary (and egg-grouped Pokemon) from eggs, although some are rarer than others. For instance, you're much more likely to get a Rattata than a Growlithe from an egg.
All first evolution stage pokemon except for legendaries can appear. This is spread throughout the eggs as follows:
You cannot get any further evolution stages of pokemon from an egg, nor can you get a legendary from an egg.
These distances were minimum distances at the start, however, that appears to have been fixed
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Best Answer
Unfortunately, all the eggs you got before that update don't contain any Pokémon from the second generation.
The content of an egg is determined at the moment you get the egg. So if your egg contained, for instance, a Charmander, it's because the egg has been determined to contain a Charmander at the exact moment you obtained it at the Pokéstop. During the update, the old eggs content has not been calculated once again, and they still contain what you were supposed to get at that point. So you can't get any second generation Pokémon from those. You will have to hatch the new eggs you obtained after the update.
This information seems confirmed on different pages and topics, like this one: