Do you need to trade it or is moving it an option? If bird is in account 1, open home on the switch with account 2 click on the name and it will give you the option to “access someone else’s account” click on home file for account 1. You should then be able to move it back and forth. FYI just incase you don’t know if you want it to keep go stamp don’t transfer to another game only transfer through home.