Pokemon GO is primarily designed to be played online, as it relies on real-time interactions with the game's servers for various features. Players need an internet connection to access essential aspects such as capturing Pokémon, participating in raids and battles, and completing various in-game tasks. However, there are certain limited features that can be accessed offline. For instance, players can view their caught Pokémon, check their inventory, and manage their Pokémon storage without being connected to the internet. Additionally, some gameplay mechanics, like walking to hatch eggs, will work as long as the app remains open on your device. Nonetheless, for the full experience and to take advantage of all the game has to offer, it is best to play while connected to the internet. If you have questions or need more information about specific features, it may be helpful to explore the official Pokemon GO web page for guidance.