Question

What are all the shiny-locked Pokemon in Legends Z-A?

Answer 1

All shiny-locked Pokémon in Legends Z-A are listed below:

Static Encounters:
All static encounters, such as Legendaries/Mythicals (all of which are Static in PLZA) and Your Starter/First Partner Pokemon are Shiny Locked. However, Starters found in the wild, postgame, are not Shiny Locked.

In-Game Trade Pokémon:
All in-game trades are Shiny Locked, meaning regional variations (among other things) that can only be obtained via in-game trades can’t be Shiny.

Pokémon Obtained Via Mystery Gifts:
All Pokémon obtained through Mystery Gifts, such as the Ralts obtainable from having pre-ordered the game and the to-come legendaries from quests, are Shiny Locked.

Source 1
Source 2
Source 3

Tell me in the comments If I missed anything please!

Comments

Are the gift kanto starters also shinylocked?

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yes, all gifts are locked

https://insider-gaming.com/are-starters-shiny-locked-in-pokemon-legends-z-a/#:~:text=Like%20the%20starters%2C%20legendary%2C%20mythic%2C%20and%20gift%20Pok%C3%A9mon%20are%20also%20shiny%2Dlocked%20in%20Pok%C3%A9mon%20Legends%3A%20Z%2DA.