Hey, you found this page as I’m still working on it. But basically there actually DOES seem to be a nacent language being developed and used in the upcoming Sinnoh-related games, Pokémon Brilliant Diamond and Shining Pearl and Pokémon Legends: Arceus. But this research has only JUST started, and you can help out too; come head over to The Research Sector over on the PA! Discord and share your thoughts on what this language could be!
That’s about it for now… but we’ll see where things go soon!