Even simpler – navigate to the Title ID folder, open main directly in PKHeX, save, and relaunch the emulator.
The most significant innovation in Legends: Arceus is the removal of the barrier between the trainer and the Pokémon. In previous games, "catching them all" involved walking in circles until a random battle triggered. Here, Pokémon exist in the overworld with complex behaviors and ecosystems. Pokemon Legends Arceus -01001F5010DFA800--v1966...
If you're experiencing issues with Pokémon Legends: Arceus and your error code looks like the one you've provided, here are some general troubleshooting steps you might find helpful: Even simpler – navigate to the Title ID