The Swords of Justice (Japanese 聖剣士sacred swordsmen) is a collective term to refer to the quartet of Cobalion, Terrakion, Virizion, and Keldeo. They are also commonly referred to by fans as the legendary musketeers.
The group is based on the French novel The Three Musketeers by Alexandre Dumas, père. Cobalion represents Athos, the oldest and de facto leader of the group. Terrakion represents Porthos, the strongest, heaviest, and largest member of the group. Virizion represents Aramis, the most feminine, vain, and romantic member of the group. Keldeo represents d'Artagnan, the youngest by far and the latest addition to the group. The group has challenged humans in legends in order to protect other Pokémon from losing their homes to human expansion.
All of the Pokémon share a secondary type, Fighting-type, and all share the Ability Justified. Many of their moves refer to swordplay, something the musketeers specialized in, such as Swords Dance and their signature move, Sacred Sword.
The Swords of Justice all made their anime debuts in Kyurem VS. The Sword of Justice. Cobalion, Terrakion, and Virizion train their youngest member, Keldeo, but before the Colt Pokémon finishes its training, it decides to test its strength against Kyurem. The Boundary Pokémon proves to be too much for Keldeo who flees from the battle, but is actively pursued by Kyurem who wants to finish their match. Keldeo is then found by Ash and his friends who help it to defeat Kyurem.
Virizion was the first to debut in Pokémon Adventures, appearing in A Direct Attack and a Daunting Defense, where it attacks Template:Adv and Template:Adv as they cross the Skyarrow Bridge, cutting up their clothing. Black later decides to capture the Swords of Justice to battle against Team Plasma and seeks out Virizion, having seen it before. He manages to find both Virizion and Terrakion near Mistralton Cave with the help of Shōko and Trish, where he battles against both of them with Buoh. Trish decides to battle with her Heatmor but is interrupted by Cobalion showing up and knocking everyone down. Trish's torch causes an explosion inside the cave, and the three Pokémon work to get everyone out, then kidnap Trish and Shōko's Pokémon. Black tracks them using Musha's dream eating abilities, and he manages to free the girls' Pokémon after telling the three legends that Trish and Shōko truly love their Pokémon. Cobalion, Virizion, and Terrakion then disappear into the distance, much to Black's disappointment since he never captured them.
The Swords of Justice have their own battle transition like the Tao trio and the Kami trio. The screen will pause, fade to black and then a sword will slash through the screen and then a glass will break into pieces and the battle starts.