>>50417141I think serebii was using google translate from the japanese site/twitter. Here's what the official US site says:
"To celebrate Pokémon Legends: Arceus, Pokémon Brilliant Diamond, and Pokémon Shining Pearl becoming compatible with Pokémon HOME, you will be gifted special Pokémon when you link each game to Pokémon HOME.
When you deposit a Pokémon from Pokémon Brilliant Diamond or Pokémon Shining Pearl to the Nintendo Switch version of Pokémon HOME, you will receive Turtwig, Chimchar, and Piplup with Hidden Abilities as Mystery Gifts in the mobile device version of Pokémon HOME.
If you deposit a Pokémon from Pokémon Legends: Arceus into the Nintendo Switch version of Pokémon HOME, you will receive Rowlet, Cyndaquil, and Oshawott with maximum effort levels as Mystery Gifts in the mobile device version of Pokémon HOME."