Pokémon HOME is a special app that enables Trainers to continue their Pokémon adventures beyond a single game system and manage their collection of Pokémon across many of their games. Pokémon HOME is available now on Nintendo Switch, iPhone and iPad (App Store), and Android (Google Play) devices. Pokémon HOME maintenance will take place on November 30 from 01:00 UTC to 06:00 UTC, after which a new update will be made available on mobile in the form of version 1.5.2.
Source: Pokemon