In Pokémon GO there has been a new update regarding EX-Raid Gyms. Now there are new Gyms all over the world that can host EX-Raids.
This means: If there are new Gyms that host EX-Raids, there will naturally be more EX-Raids. So you now have better chances of being invited to such a raid.
It is worth checking your nearby parks. There might be a new EX-Raid Gym there now.
What we know about the new EX-Raid Gyms
This is included in the new update: Niantic has not announced anything significant, but there are new Gyms in Pokémon GO. The focus has been on increasing the density of EX-Raid Gyms. PokéStops have been converted directly into EX-Raid Gyms.
What can an EX-Raid Gym do? Only these special Gyms can host an EX-Raid. Whether a Gym is suitable for that can be recognized by the mark in the upper corner of the Gym. If it says “EX-Raid-Gym” there, then this Gym could also trigger such a raid.
This is why the update is important: Some locations had no EX-Raid Gym or only a few of them. Now that there are more, more EX-Raids can also be triggered.
This is especially important as the defense form of Deoxys is available in raids for the first time now. The next EX-Raids will provide you with the new raid boss.
How do I trigger an EX-Raid? Just because a Gym is an EX-Raid Gym, does not mean that an EX-Raid will necessarily take place there. To trigger such a raid, you need to do a significant number of raids at that Gym.
If enough players have raided there, invitations to the EX-Raid will be distributed. You can then share this invitation with a friend.
We have listed the best counters against the EX-Raid boss Deoxys for you here:

