There have been many bonuses after Pokémon GO’s summer of live events that have asked players to complete 15.3 million research tasks to unlock special prizes. Previously, they were just used to acquire Alolan versions of original 150 Pokémon, but now there’s a chance for these regionals as well. You have about 12.5% chance of getting a regional from these eggs, though that includes regionals you may already have. Mime – 2.25%So if you’re looking for one of these specially, it’s about a 1 in 25 chance to a 1 in 50 ish chance you’ll land one. That’s a lot of eggs to hatch, and that’s provided you don’t have extra bad luck that makes it take even long.

Source: Forbes September 16, 2018 14:48 UTC