Use community-standard Link Trade Codes (like 4448 4448 for Dittos) to find specific Pokémon.
If you're building a "content" package or just setting up your game, these official resources are the best places to start: Pokemon Violet [01008F6008C5E800][v196608][US]....
Keep an eye on the Official Pokémon Scarlet/Violet site for active Tera Raid Battle events and Mystery Gift codes. Quick Tips for Creators Official Website - Pokémon Scarlet and Violet Use community-standard Link Trade Codes (like 4448 4448