Niantic recently announced through a YouTuber (click here for the article) that egg exclusivity will be tackled in upcoming events. That means that no or at least less Pokémon can only be obtained through eggs during events. Without a real announcement the first adjustment is made for it Pokémon Day 2020 event that starts next Tuesday.
Initially Bulbasaur, Charmander and Squirtle with Party Hat could only be found in eggs, but that has changed. In the announcement you can now read that the threesome comes from eggs and can be found in raids.
All other bonuses that we get in the game from Tuesday, you can find on our social media from Tuesday on, via Facebook, Telegram and WhatsApp.
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