Forgive me and feel to free to move this or merge if this thread is in the wrong place. Or should this be a blog?
As the title says, should the Swords of Justice be considered one of the legendary trios? Yeah, it's a "quartet" because it has four members but its clearly meant to be akin to previous legendary trios, and in addition, Keldeo is shown to be a special member.
All three normal members are to be found at in-game locations in both games (B/W or B2/W2) during normal gameplay. That's more similar to previous trios than the Kamis because you can only find one Kami if you have only one game. And obviously, they have that 580 BST. Also, the story of the Three Musketeers has them as the Three Musketeers even after D'artagan was added, I believe.
Bottom line, do you think the Swords of Justice (who only refer to the main 3 in the movie BTW) be considered a legendary trio?