Sonic, along with Pikachu, Ash's Galar Pokémon Team, and Goh's Pokémon Team are sucked into the world of King Arthur where they are tasked with slaying the corrupted king (Sonic and the Black Knight belongs to SEGA, Pokémon belongs to Nintendo).
Sonic: I don't suppose you're gonna let me by? Heh! You look just like this knucklehead I know!
Gawain: Ho! You dare mock Sir Gawain, knight of the Round Table!?
Doublade: An act most unwise, my friend!
Dracovish: That's a Doublade!
Rei: Doublade?
Sonic: Rotom Phone?
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Rotom Phone: Doublade. The Sword Pokémon. A Steel & Ghost Type. And the evolved form of Honedge. The complex attack patterns of its two swords are unstoppable, even for an opponent greatly accomplished at swordplay.
Caliburn: Two swords as a whole Pokémon?
Akari: That's extraordinary.
Sonic: Wait, wait! I'm not trying to pick a fight with you. I was heading to a cave to save some people from a dragon.
Hisuian Decidueye: He's right, y'know.
Gawain: Bah! You cannot fool me with your lies! No doubt you're after the dragon's treasure!
Pikachu: Oh, man... You sound just like that knucklehead, too!
Gawain: You have defied King Arthur. This place shall be your grave!
[Charges forward]
Gawain: To lose to a mere apprentice... I have been disgraced! [Gawain points one of Galatine's swords to himself.] Only death can remove this stain upon my honor.
[Lucario takes the sword away.]
Lucario: Gimme that!
Sonic: Gimme a break! What's up with all this drama?!
Gawain: Silence! Silence, I say! A Knight who fails their king is unfit to live!
Sonic: Isn't there more to being a knight than just serving a king?
Doublade: Huh!?
Sonic: I'm outta here. People to save, ya know?
Pikachu: Okay, let's get our thoughts together. So, Tails is supposed to be the blacksmith. Amy's the Lady of the Lake. Shadow's supposed to be Sir Lancelot. And Knuckles is supposed to be Sir Gawain.
