>>50528714Terrakion was a fucking monster in BW. He was the face of OU until Lando went Garfield in the next game.
Keldeo also deserves a shoutout for shitting on Chansey/Blissey like a special sweeper has no business doing.
The others aren't great, but they collectively had more of a splash than the Lake midgets and the Regi studs before them.
Even compared to the Birds and the Beasts, who each have one rock-solid member in Zapdos/Suicune, the Swords are pretty alright.
>>50531052What does Mesprit do again?
>>50534934The lore is that they're big-shot epic heroes who live solely to kick the everloving shit out of warmongers and bad guys of all types.
They're Legendary Pokémon because they actually did legendary deeds, e.g. Terrakion toppled a whole castle on his own just to introduce his horns to the guy in charge.
As for Crown Tundra, uhhh... yeah, there's not much background there. It's Sword/Shield Version and there's a Crown guy floating around, so GameFreak just decided it'd be weird to leave them out.