Pokemon Sun and Moon is out, meaning there are some new legendary Pokemon to catch. If you decided to pick up the Moon version of this generation, then that means you’ll be chasing after Lunala.
Beware that there are some slight spoilers of the game in this guide, so avert your eyes if you don’t want to be spoiled.
As the story progresses, you learn that Lusamine has an obsession with Ultra Beasts and soon after, you and Lillie must go to Ultra Space to retrieve her. Once you clear Vast Poni Canyon there will be a cutscene explaining that you must go up the Altar of the Moone, it is there where you will use the Moon Flute found on Exeggutor Island. This will then summon Lunala, but you will not be able to battle it until after you go to Ultra Space to save Lusamine.
Once that is done, you’ll have another cutscene before battling Lunala at level 55 with a Psychic and Ghost typing. It will also have the ability Shadow Shield, which reduces the amount of damage it will take if it is at full health. Because it’s a Ghost type, Normal and Fighting moves will not work on it, so you can’t use False Swipes or Hold Back for an easy capture. Any other move should make this easy while Dark and Ghost type moves do four times the damage.
You can use those moves if you have a Pokemon that is a lower level so you can worry a bit less about Lunala fainting. Even if it does, you will have a chance to save before the battle so you don’t have to feel the need to hold back. Get its health in a red or yellow state, then feel free to use whichever Poke Ball you are the most comfortable with.