* Save File Structure: Pokémon SoulSilver (and all main series Pokémon games) store your save data in a single file. This means that starting a new game overwrites the existing save data.
* No "New Game" Option: The game doesn't offer a "New Game" option once you've already started a game.
Here are your options if you want to play a new game:
1. Delete Existing Save: You can delete the existing save file on your game cartridge or on your virtual console. This will allow you to start a fresh game when you launch SoulSilver again.
2. Start a New Save File (Virtual Console): If you're playing on a virtual console (like the Nintendo Switch Online), you can create a new save file within the game's settings. This will create a separate save slot, allowing you to play both your original save and a new game.
Important Note: Make sure you're comfortable with deleting your save file before doing so. There is no way to recover a deleted save file.