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Since everyone on the internet is very dumb I will explain step by step for my fellow 4chan niggers.
1- You need a living dex, yes even mythicals.
2- They need to be deposited on bank, each and every one. you don't need special forms like pika hats or vivillon patterns the 890 base should suffice
3- On home, move every pokemon one box to the left (use the mass select option) box 2 goes to 1, box 3 goes to 2 and so on
4- quit and save the changes, close the home on switch and open home on your phone.
5- profit. The magearna should be on the mystery gift section. Now repeat all steps as much as you want.