>>57006158It's an annoying chore but a rewarding one.
You need to register every species from Paldea, Kitakami and Blueberry in the Home dex, but they must come from those games (caught or hatched). So your Cranidos from PLA won't count unless you breed it in SV.
Some species can be evolved by yourself in PLA (like normal Golem and Dusknoir) or BDSP (Milotic). Or you can fish for a raid in SV.
You can track your game-dex-but-in-Home progress in the mobile app if you tap on your name (where the points counter is) on the main screen.
Once you're done, you'll receive that shiny onahole in Home.