>The Japanese Pokémon HOME FAQ has updated with some further clarifications about Pokémon HOME.
First, you don't need a Nintendo Account to run the mobile version of the app. You can connect it to your account at any time. Without a Nintendo Account connected, you won't be able to share data with the Nintendo Switch version, transfer from Pokémon Bank using the Nintendo Network ID method (Premium Subscriptions only), checking Nintendo Switch Battle Data or transferring the Pokémon HOME data to another phone.
Some further clarifications were given as to what happens when your subscription lapses. The game itself has a Free Box, this box allows for you to transfer from Let's Go, Sword & Shield or receive Mystery Gifts without the Premium Plan, and then it has more boxes for the Premium Plan users. If your plan lapses and you have space in the Free Box, you will not be able to move Pokémon from Premium Boxes until you have renewed your Premium Subscription.