The Galaxy Team's Entry Trial Mission - Pokemon Legends: Arceus 

In the last mission, you were told to rest up in your current lodgings in Jubilife Village.

For the morning after, you will be awoken to start your trial.

You must start by choosing your starter Pokemon.

When in the headquarters, leave it. Go to the front gate.

Win the battle against Volo to receive 5 Potions.

Travel to Obsidian Fieldlands and find three specified types of Pokemon.

Bidoof, Starly, and Shinx and learn exploring.

It's time to go back to your quarter and try on your new uniform.

You need to go back to the headquarter and make your way to the ground floor. You will meet with Commander Kamado there.