How to trade pokemon with yourself on Switch?
You can't actually trade with yourself unless you have more than one game and more than one switch. Plus, I believe the Sword and Shield games save to the actual Switch so I'm not sure how that would work if you had your profile on two switches, like if you'd have a different save file or what. However, you can transfer pokemon through Pokemon Home from one game to another, like if you have save files for Sword and Shield under the same user profile. This works in the free and paid versions of Home.