You must legally own the game on Switch and "dump" your own game files (ROMs) to your PC for this to be legal.
Pokémon Legends: Arceus is a Nintendo Switch exclusive. of the game. Sites offering a "free PC download" are often scams that may contain malware or viruses. ⚠️ Safety Warning PokГ©mon Legends Arceus PC Download gratuito
Be extremely cautious of websites promising "Pokémon Legends: Arceus PC Download gratuito." You must legally own the game on Switch