Pokemon GO frequently swaps Raid battle bosses in and out of rotation with each event that comes and passes with every new season of the game. These Raid bosses are spread out across different difficult levels, with 1-Star Raids featuring less-threatening Pokemon, who are often first form or basic Pokemon sometimes more commonly seen in the wild, 2-Stars, 3-Stars, and 4-Stars start to see secondary and final evolutions come into play, as well as more rare Pokemon or those with more significant stats to consider. 5-Star Raids always feature a Legendary/Mythical Pokemon, and are among some of the most difficult to beat, other than Shadow Raids and Mega Raids.