Hi!
In the game, there are a total of 70 Pokémon, of which 6 are fossils (Kabuto, Omanyte, Lileep, Anorith, Cranidos, and Shieldon).
Additionally, you can use Ditto to transform into a fossil, giving you 7 (and it counts for the passive boosts of Lileep and Shieldon).
There’s no way to release eggs, but the price has a cap, just like leveling up, it doesn’t scale infinitely.
Sending you a list of all 70 Pokémon might be a bit long, so I’m sending you a picture instead:
