Serperior is the latest 7-Star Star Tera Raid boss in Pokmon Scarlet & Violet, and it has certain weaknesses that must be exploited with the right counters if you want to beat it. The Regal Pokmon is the third Unova-region starter to get their turn in 7-Star Tera Raids, where you can defeat it in exchange for a bunch of rewards and the opportunity to catch it. Like those that came before, this Serperior boss has the Mightiest Mark, making it a tough challenge that requires players to prepare a strong team of Pokmon with their optimal movesets.

https://screenrant.com/pokemon-scarlet-violet-serperior-7-star-raid-guide/