Sir Lancelot/(Shiny) Lucario
Reason: Sir Lancelot is famously known as the best knight of King Arthur's Round Table. Strong, gifted with special powers and objects, and handsome, I can't think of a better Pokemon to represent Lancelot than a Shiny Lucario. I chose Inner Focus as it's Japanese name fit better than Lucario's other Abilities (Inner Focus's Japanese name is "Force of Will". Its other Abilities are Steadfast & Justified, Japanese names "Indomitable Heart" & "Heart of Justice" respectively, I skipped over due to the dark turn in the Round Table's story caused by Lancelot's lust for Arthur's wife).
Sir Tristan/Conkeldurr
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Reason: I chose Conkeldurr for Sir Tristan for two reasons. One, Tristan is considered the second strongest knight of King Arthur's Round Table, behind Lancelot. Second, there is an old granite pillar in a concrete base in South West England called "The Tristan Stone" which has a plaque suggesting that's where Tristan is buried. He is a rival friend of Lancelot, so I also find it fitting to make him the other Fighting-type in the Crown Tundra (and also focused on a super Physical offense build as it was said their duel was the greatest duel between knights ever).
Sir Lamorak/Gurdurr
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Reason: Sir Lamorak is the third strongest knight of King Arthur's Round Table, behind Tristan and Lancelot; hence I made him an Eviolite Gurdurr. Lamorak was known for his strength, fiery temper, and "feats of martial prowess" such as fighting off at least thirty knights by himself, so I decided to give Gurdurr a Iron Fist focused set with wide coverage. Lamorak started out as enemy of Tristan though they later became best friends, so I feel him being a Gurdurr and Tristan a Conkeldurr was also fitting.
Sir Galahad/(Shiny) Absol
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Reason: Sir Galahad is famously known as the son of Lancelot and one of the knights who found the Holy Grail. Galahad is believed to be a "chosen one", his story filled of him having visions, performing miracles, and ultimately leading to his death though by his one choice and ascends to heaven. With this I chose Shiny Absol to represent him, notably for his visions (he saw other knights dying if they went looking for the grail), and gave him a Super Luck set emphasize his special status (and a Shell Bell as a loose representation of the Holy Grail's healing power). Also, as a bit of a joke, I gave him Knock Off as originally the Holy Grail story was more of Sir Percival's story though later tellings made it more about Percival, so metawise Galahad took the Holy Grail from Percival (you could also say he's a "knock off" of Lancelot; Galahad and his stories has a lot of "Gary Stu" traits).
Sir Gawain/Galarian Rapidash
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Reason: There's quite a few reasons why I made Sir Gawain a Galarian Rapidash. One, he's known as "The Maiden's Knight", which fits with Rapidash being based on a unicorn which only appear before maidens. Gawain was also the defender of the poor and a healer, knowing how to use herbs, which fits with Pastel Veil. While not Galarian Rapidash, in some tales Gawain's power related to the sun (he was strongest during the noon but waned when the sun set), which you could stretch to normal Rapidash which also is empowered by harsh sunlight being a Fire-type. Finally, a possible origin for his name is "Gwallt Avwyn" which translates to "hair like reins" or "bright hair", which matches pretty good with Galarian Rapidash. As a final note, Gawain is best known for his role in the story of the Green Knight. I referenced this story by giving it Throat Chop (in the story Gawain beheads the Green Knight... only for the Green Knight to put his head back on and saying he'll do the same to him in a year's time, starting Gawain's quest) and Focus Sash (during the story Gawain is given a sash that'll protect him from harm, hoping it'll save him from the Green Knight; pretty fitting for what Focus Sash is and does!).
Sir Percival/Escavalier
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Reason: As I said above, Sir Percival was the one who originally found the Holy Grail; much of his story is connect to it infact. So, why a Escavalier? Well, it mostly has to do with his name origin, either coming from the Welsh "Peredur" ("par" meaning "spear" and "dur" meaning "hard/steel") or the French "perce val" (meaning "pierce the valley"). Another reason has to do with how Percival became a knight, long story short, he was raised in the forest and one day saw a group of knights and is amazed by them and their armor (sort of like Karrablast liking Shelmet's armor that it takes it, even gaining the Ability Shell Armir). While the Search for the Holy Grail was hijacked by Galahad, Percival was still very part of the story. An early part of the story involves Percival meeting the Fisher King, an unknown king who guards the grail. The Fisher King is crippled and spends his time fishing (at the time Percival failed to heal the king, but after finding the grail comes back to successfully heal him and in some tales is awarded a kingdom for doing so). Thus, I gave Escavalier Leftovers to reference the healing power of the Holy Grail, and the move Razor Shell to reference the Fisher King.