Eternatus, the Gigantic Pokémon, has appeared! And with Galar in chaos due to the Gigantamax phenomenon occurring all over the region, Henry and Casey's only hope of defeating Eternatus-and stopping the Gigantamax evolutions-is with the help of two powerful Pokémon-Zacian and Zamazenta!

Can two Pokémon find the legendary gears in time to stop Eternatus?!