Question

Is there a Shiny Charm in Pokemon Legends Arceus?

Comments

You get it from getting research level 10 on every Pokémon I believe

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Pretty sure Austin John Plays and aDrive both did videos about Shinies and the Shiny Charm

Answer 1

[Answering to get this off Unanswered]

Yes, the Shiny Charm is available in Legends:Arceus.
Here's a screen grab from YouTuber Sloppy Gaming:

As mentioned, more popular YouTubers have also obtained it.

According to Serebii, it can be obtained by

getting Research Rank 10 with all 242 Pokémon within the game.