One of the newest legendary Pokemon that you can catch in Pokemon Sun and Pokemon Moon is Tapu Koko.
After picking up your starter Pokemon in Alola region, you most probably have met Tapu Koko in the first island as it saved you from the bridge. Luckily, you are able to catch it but not until later in the game.
Here’s how to catch the legendary Tapu Koko:
Pokemon Sun & Moon – Catching Tapu KoKo
After becoming the first Alola Champion, you now have the opportunity to catch the illusive Tapu KoKo. In celebration of your achievement, Lillie will tell you to go to the Ruins of Conflict.
Once you get to the ruins, Lillie will ask you to make a wish at the Pedestal. Tapu KoKo will then challenge you with it being level 60.
If at some point you defeated it instead of catching it, you can re-challenge it by defeating the Elite Four.
Make sure that you have enough Poke Balls as it can be quite challenging trying to catch it. As soon as you catch it, you will get Tapu KoKo at level 60 with the following move set:
Please note that Tapu KoKo is the first of the four Legendary Pokemon that you can catch.