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Pokemon Scarlet & Violet: The Indigo Disklets you travel back to Unova to a new location called Blueberry Academy. This High-tech building has an underground playground called the Terarium, where many Pokemon roam around different artificial Biomes.
As you progress through the DLC’s main story, you’ll be able to do something that has never been possible before in the series: to find every Starter Pokemon as a wild Pokemon. However, this will require some extra hard work, and here we’ll tell you about it.

How To Get Every Starter Pokemon
To be able to find all the Starter Pokemon in the Terarium,you must first visit the BB League Room and unlock the Support Board, which allows you to donate BP to unlock different stuff. This happens naturally as you progress in the story, sojust keep playing until it happens.
Once you have unlocked the Support Board, you mustfulfill the four Terarium Club donations, each one asking to invest 3,000 BP.Unlocking each one will enable different starter Pokemon to come to the Biomes as wild Pokemon, andthey’ll be separated into specific groups depending on the biome.

Keep in mind that this doesn’t apply to the Paldea Starter Pokemon, and you must trade them with other players to get them.
Starter Pokemon Locations
you’re able to find the following Starter Pokemon in the following areas: