
After The Pokémon Company International announced last week that players will “soon” be able to link Pokémon HOME (their cross-platform cloud subscription service that allows for transferring Pokémon across games and generations) with Pokémon Legends: Arceus, Pokémon Brilliant Diamond, and Pokémon Shining Pearl, they surpassed people's patience expectations by making that available... as of publishing. Version 2.0.0!
That means that you can transfer Pokémon from Shining Pearl, Brilliant Diamond, Sword, and/or Shield to Pokémon HOME... and then trade them to any of those, or to Pokémon Legends: Arceus. If they go there (back in time), they'll be put into a Strange Ball, which is this minty colour Poké Ball. Pokémon from Pokémon Legends: Arceus can also go to any of those games too (and will also appear in Strange Balls)—though it won't work out if they're exclusive to Pokémon Legends: Arceus or not in a game's Pokédex. Pokémon moves and levels may also be changed... They aren't deleted though, if you put a Pokémon in, move it somewhere, and move it back to where it was, it can still have its original info (including moves, ball, and Alpha status).
Spinda cannot be transferred to/from Pokémon Shining Pearl or Pokémon Brilliant Diamond to Pokémon HOME.