You'll need to acquire the first gym badge to open up trading. You'll then head to the Pokemon Center and go downstairs. After talking to the npc, leave the Pokemon Center, you can then open up the Union Room by pressing the button 'Y'.
Shiny Mew and Shiny Mewtwo for Pokemon Sword and Shield + 2 Masterballs
Pokemon Sword & Shield - Mew non shiny and Mewtwo Shiny
Pokémon Account Go Shiny Background Mewtwo Shiny Galarian Zapdos
Shiny Mew Pokémon Scarlet And Violet Perfect IV
Shiny Mew (6IV Japanese) for Pokemon Sword and Shield + Masterball
