What's your favorite Legendary Trio/Quadrio, /vp/, and why? Not counting the Box Legendaries (but making an exception for Suicune), but groups like the Legendary Birds, the Legendary Beasts, the Regis, the Lake trio, the genies, and groups of four like the Swords of Justice, the Tapus, the Treasures of Ruin, and so on.
For me, it's the Beasts. G/S/C was the first time any lore was associated with Legendaries, and the story of three mysterious Pokemon getting killed in the past and revived into new Pokemon that you 'unleash' and have to chase all over the continent was pretty cool back then, and certainly made them feel unique.