All but one static Pokémon in Scarlet and Violet The Teal Mask looks to be Shiny Locked
Shiny hunters are going to have a field day with the new map and Pokémon in Scarlet and Violet’s The Teal Mask DLC, however, there is one key factor that will end up disappointing players who want to try and find colorful variants of some specific species.
According to a datamine of SV’s version 2.0.1 update, any static encounters in the DLC are Shiny-locked—including Gift Pokémon. This means if you receive a Pokémon from an NPC or are guaranteed to encounter that Pokémon every time you meet specific requirements, it can’t be a Shiny.