A new event is live for Pokemon Shuffle players that affords them the chance to catch another of Hoenn's legendary Pokemon. The Pokemon Regirock is now available to be caught and is the first of the Regi's to become available. The first time the event is completed the player will be awarded with 1000 coins and you will have 30 moves to win the battle and get your chance to get this legendary. In order to access this new event you are going to need to Check In on the game and receive the latest update to the game version 1.1.12.
You will have a few weeks with this challenge, with it running until May 25th so you better get ready to try and get this Pokemon.
I imagine the other Regi's should appear in subsequent events.