Getting the three elusive Pokemon requires patience as trainers will need to max out certain stats in three of their Pokemon. If you have the time to max out a certain stat, then you are ready to get the three legendary Pokemon.
Catching Cobalion, Terrakion, Virizion
One requirement that is needed to catch the three Pokemon is that you max out the Effort values of your three Pokemon on your team. Once you’ve done that, soar around Pacifidlog Town until you discover a large island called Pathless Pain.
As soon as you enter the island, you will see a portal. Interact the portal and one of the three Pokemon will challenge. Depending on what day it is, you can only catch one of the three:
Cobalion – can be captured on Sunday, Wednesday and Friday
Terrakion – can be captured on Tuesdays and Saturdays
Virizion – can be captured on Mondays and Thursdays