Nintendo announced that we will get a chance to catch a shiny Rayquaza in Pokemon Scarlet and Violet in December 2024 and January 2025, thanks to a Tera Raid Battle event.
Pokemon Scarlet and Violet are available for the Nintendo Switch.
Since this is a five-star event, you will need to have beaten the main campaign in Pokemon Scarlet and Violet and beaten the elite four to find the Rayquaza.
There’s also an animated trailer accompanying this news that shows a shiny Rayquaza flying across the Paldean cities and environments.