This Theme is played, when you encounter a Wild Tera Pokémon.
It's the Unova (Stronger) Wild Battle Theme but Extended

From Pokémon Scarlet/Violet The Hidden Treasures of Area Zero Part 2: The Indigo Disk

"Recorded InGame with a Portable Audio Device in HQ connected to my Switch."
PS read the Channel Description... You get it what I meant if you know these other two special YouTubers LOL

Donation Links:
http://kofi.com/dialga22239
https://www.buymeacoffee.com/dialga22239

Become a Patreon:
  / dialga22239  

WIP and Updates here:
  / dialga22239  

Join my Discord Server:
  / discord