Pokémon GO’s Legendary and Mega Raids in February 2023 have been announced by developer Niantic and will bring back many older Pokémon rather than introduce new ones; however, a few surprises are in store for players. Legendary Raids are 5-star activities that feature Legendary Pokémon. These are often high-end activities that require a large group of Trainers to complete adequately. Of course, some are easier than others, depending on the opponent’s typing and CP (Combat Power), but groups of at least three or four players are usually necessary.
https://screenrant.com/legendary-mega-raids-pokemon-go-january-2023/