Pokémon Scarlet and Violet players can once again challenge a 7-star Skeledirge with the Mightiest Mark in Black Tera Raid Battles from Sept. 11 at 12 a.m. UTC through Sept. 17 at 11:59 p.m. UTC. The returning Skeledirge has the Fire Tera Type and can be caught once per save data, although players who previously caught it can still battle it for additional rewards. Trainers can take on the powerful Tera Pokémon with up to three other players, while those who have not unlocked Black Tera Raid crystals can join through multiplayer. The event requires the latest Poké Portal News update and takes place exclusively in the Paldea region.
Source: Official Pokémon website
Nintendo & Pokémon Blog 