I can post this as an answer if you want but :P I don't have SwSh nor home nor pokemon go so I dont understand any of this but APPARENTLY yiu can trade a pokemon from go to home. Then, you get a special gift gmax melmetal that can be transferred to swsh. Now idk how reliable this is but I found it on multiple sites, so I think? Anyway source:google (more specificly gaming websites and pokemon official)