Several community hubs provide "starter" or "100% complete" save files:
In the context of Skyline and Nintendo Switch emulation, a save file represents your in-game progress. On a physical Switch, this data is stored on the console’s internal memory or an SD card. In emulation, this data is stored in a digital format that the emulator reads to populate your game state. pokemon sword save file for skyline
Every Switch game has a unique Title ID. Skyline organizes saves by these IDs. Several community hubs provide "starter" or "100% complete"