The 6th Global Misssion for Pokémon Ultra Sun and Ultra Moon called Hatch a lot of Eggs! will take place from April 3rd, 2018 until April 16th, 2018. 5 million eggs need to be hatched worldwide for participants to receive 2,000 Festival Coins. Please note that the in-game goal states that the requirement is 3 million, not 5 million that the press release originally stated.

The Next Global Mission Is an Eggs-travaganza!

Pokémon fans, it’s your time to shine as the “Hatch a lot of Eggs!” global mission in Pokémon Ultra Sun and Pokémon Ultra Moon involves hatching as many Pokémon Eggs as you can. The goal is to hatch 5,000,000 Eggs worldwide between 00:00 April 3, 2018, and 23:59 April 16, 2018 (UTC). If this Eggs-traordinary goal is reached, every participant will receive 2,000 Festival Coins as a reward for doing such an Egg-cellent job.

Even if the goal isn’t reached, everyone will get a participation prize of 1,000 Festival Coins. Trainers who have registered their game at the Pokémon Global Link by the end of the global mission will receive double the number of Festival Coins—4,000 when the goal is reached, and 2,000 even if it isn’t. Be sure to sign up today.

In order to discover Pokémon Eggs in Pokémon Ultra Sun and Pokémon Ultra Moon, you will need to play the game until you reach Akala Island. There, you will find the Pokémon Nursery nestled within Paniola Ranch (just north of Paniola Town). If you drop off two compatible Pokémon there and leave them for a while, you may find an Egg when you return.

Pokémon Eggs are normally only found if Pokémon with opposite genders are left together in the Pokémon Nursery. Pokémon of similar types and caught in similar locations are often compatible, especially Pokémon of the same species. Ditto is a very handy Pokémon to leave at the Pokémon Nursery, as it can be paired with just about any other Pokémon. When you speak to the lady outside the Pokémon Nursery, she will tell you how well the two Pokémon you dropped off get along. The more the Pokémon like each other, the higher the odds that she’ll discover an Egg.

Now that you know what to do, it’s time to get cracking and hatch as many Pokémon Eggs as you can. Together, we can make this global mission an Eggs-plosive success!

Source: https://3ds.pokemon-gl.com/information/62a9ebe2-339d-4c8e-9e7b-c91fb046c7ca