In Pokémon Legends Arceus, there are 242 Pokémon to obtain. These roam Hisui or hide in small nooks. Some of them require you to have advanced enough to unlock a quest of their own like Darkrai, Shaymin or Giratina. It is also the banned Pokémon that interests us for this guide.
How to find Giratina
First of all, to find it, you will need to have finished the main quest asking you to get all the plates and then face Giratina. After the confrontation, a cutscene takes place and Giratina leaves.
After you come back and talk to the Professor. He'll tell you about a shadow that has been seen on the Cobalt Coastlands. Following this scene, you unlock access to the side mission about finding Giratina.
To meet him, head to the Cobalt Coastlands and get to the cave after climbing the mountain.
Upon entering the cave, Giratina will be there and he will be waiting for you to come. Note that if you have not advanced far enough, you will find an empty place.
How to capture Giratina
To capture it, you will have to initiate the fight by advancing towards it.
During the fight, you will have to weaken it to allow you to capture it more easily. If you knock him out, don't panic, he reappears. To help you, here is information about Giratina. In addition, a Fairy Pokémon will allow you to nullify its Dragon attacks.
Once captured, he will leave the Platinum Globe behind which will allow you to change his form by using it on him.
Here is the complete interactive map of Pokémon Legends Arceus allowing you to easily locate all the resources and all the points of interest of the region of Hisui.