>>45224987To catch Moltres keep flying to the station entrance on the Isle of armor until you see it fly to the ocean, ignore it stand here. Moltres will eventually come here and it will see you and attack.
As for Articuno, I kept re-flying to the snowbank area until it flew over my head and followed it to that clifside the bird that raises a wing is the real one it will disappear and reappear to start the fight.
From then on out it's on you.Bring Fug with you for Articuno if it's hailing