Casey Shield, a hacker who invented the Dynamax Simulator, and Henry Sword, a boy who repairs gear for Pokémon, both dream of entering the Galar region's Gym battles. For Casey, it's a chance to reunite with her lost Pokémon. For Henry, it's an opportunity to search for the legendary Rusted Sword and Rusted Shield.

Henry and Casey continue to search for the lost Rusted Sword and Rusted Shield as Henry trains the Kubfu, the Pokémon from the Isle of Armor. But a new danger presents itself...

Can our team figure out how to reverse the effects of Eternatus's poison?!