To get this Shiny Meloetta, you have to follow a few instructions as listed in the official news posting in Pokemon HOME.
- You need the mobile device version of Pokemon HOME on either iOS or Android.
- In order to use the Mystery Gifts feature, you must have a linked Nintendo account.
- You will only be able to receive each Mystery Gift once per Nintendo Account.
"Complete your Paldea Pokédex, Kitakami Pokédex, and Blueberry Pokédex, then confirm your completion in the Games tab of Pokémon HOME. If you have already completed these Pokédexes, you are still eligible to receive this Mystery Gift."
They finish the news posting by teasing more Pokemon to be given away in the future for completing different Pokédexes for different games, presumably the Kanto Pokédex from Pokémon Let's Go, Pikachu! and Let's Go, Eevee!, The Galar, Isle of Armor, and Crown Tundra Pokédexes from Pokémon Sword and Shield, the Sinnoh Pokédex from Pokémon Brilliant Diamond and Shining Pearl, and the Hisui Pokédex from Pokémon Legends Arceus.
"We plan to add more Mystery Gifts for completing other game Pokédexes in the future. We hope you'll enjoy them!"
- Sources
- In-game News Update