Receive special Pokémon as Mystery Gifts for completing specific Pokédexes in the mobile device version of Pokémon HOME! Get Shiny Keldeo by completing the Galar Pokédex, Isle of Armor Pokédex, and Crown Tundra Pokédex. Grab Shiny Meltan by completing the Kanto Pokédex!

Complete Pokédexes to Earn Shiny Keldeo and Shiny Meltan in Pokémon HOME

Shiny Keldeo, Shiny Meltan, and other rare Shiny Pokémon can be yours by completing Pokédexes in Pokémon HOME. The recent version 3.2.2 update for Pokémon HOME added the ability to earn special Pokémon via Mystery Gift by completing specific game Pokédexes. Two new rewards are now available in Pokémon HOME for diligent Trainers who have made it their mission to collect every Pokémon within a region. Now, if you have completed your Galar Pokédex, Isle of Armor Pokédex, and Crown Tundra Pokédex (from Pokémon Sword and Pokémon Shield), you will receive a Shiny Keldeo. If you’ve completed your Kanto Pokédex (from Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee!), you will receive a Shiny Meltan.

Pokémon HOME Pokédex Completion Mystery Gift Rewards

Shiny Keldeo and Shiny Meltan round out an exciting batch of special Shiny Pokémon that you can earn by completing your Pokédexes in Pokémon HOME. See below for the full list—and don’t forget that in addition to catching the necessary Pokémon yourself, you can also trade with Trainers across the world!

• Complete your Paldea, Kitakami, and Blueberry Pokédexes (from Pokémon Scarlet and Pokémon Violet) to receive Shiny Meloetta.
• Complete your Hisui Pokédex (from Pokémon Legends: Arceus) to receive Shiny Enamorus.
• Complete your Sinnoh Pokédex (from Pokémon Brilliant Diamond and Pokémon Shining Pearl) to receive Shiny Manaphy.
• Complete your Galar, Isle of Armor, and Crown Tundra Pokédexes (from Pokémon Sword and Pokémon Shield) to receive Shiny Keldeo.
• Complete your Kanto Pokédex (from Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee!) to receive Shiny Meltan.

To receive these Pokémon, you must complete the corresponding Pokédexes in Pokémon HOME, then confirm your completion in the Games tab. If you’ve already completed these Pokédexes, you’re still eligible to receive the Pokémon. Be aware that to receive Mystery Gifts, you must have a linked Nintendo Account, and each Mystery Gift can only be received once per Nintendo Account. Enjoy earning these special Shiny Pokémon, Trainers!

Source: https://www.pokemon.com/us/pokemon-news/complete-pokedexes-to-earn-shiny-keldeo-and-shiny-meltan-in-pokemon-home