Zeraora is a Mythical, which means it's an event only Pokémon. This means that you can't trade it online, and that it needs to be hacked via your save locally. Also I don't recommend going online just yet. Even though it's technically out in New Zealand I would recommend going online at around 12 AM UTC, as by then people actually have it in New Zealand. It's there just 2 AM, at which people are unlikely to go online, also the PGL is still down. Which means that if you go online they possibly can add you to a "to ban" database.