Pokemon Go Mega Sableye to be the Surprise Mega Raid Boss from June 29-July 6, 2023

Trainers, Niantic and Pokemon Go announced the next Season and revealed what’s coming in June 2023.
The next Season of Pokemon Go is called Hidden Gems. Just like every other Season, this Season will also last for three months, starting June 1, and ending on September 1, 2023. During this period you can catch new Pokemon, and new shiny Pokemon, participate in Raids, complete Field Research to unlock Research Breakthrough encounters, and participate in many events.
Niantic and Pokemon Go revealed what’s coming in June 2023, including the next Raid Bosses in Raids, Shadow Raids, and Mega Raids.
In June 2023, you can battle and catch three different Mega Evolutions in Mega Raids, Mega Swampert, Mega Sceptile, and a surprise Mega Raid Boss. Mega Swampert will be available in Mega Raids from June 1-June 15, Mega Sceptile from June 15-June 29, and the surprise Mega Raid Boss will be taking over Mega Raids from June 29-July 6, 2023.
Now, thanks to the world’s greatest miners, and the community on Discord, we know which Mega Pokemon is the surprise Mega Raid Boss – Mega Sableye.
Thanks to some eagle-eyed folks in our discord that alerted us to this, Niantic themselves leaked (in the website's data) the unknown Mega Raid on June 29: It's Mega Sableye. pic.twitter.com/yhxu4m3llr
— PokeMiners (@poke_miners) May 31, 2023
Starting June 10, 2023, Shadow Articuno will appear in Shadow Raids during weekends in June. Shadow Articuno can be shiny.
The Hidden Gems Season looks promising, so make sure to participate in every event and enjoy all features and bonuses.