The Pokémon Eternatus nearly managed to destroy the region of Galar twice, once before and once during Pokémon Sword and Shield, but not without the help of Chairman Rose. The majority of Pokémon Sword and Shield’s plot focuses on the Galar Gym challenge, during which competitors who have been sponsored by established Trainers travel the Galar region to obtain the Gym Badges. Trainers who can earn all the Gym Badges from the Pokémon Gyms compete in a tournament for the chance to battle the famous Champion Leon himself. But the region is placed in dire straits when Chairman Rose revives Eternatus to recreate the Darkest Day.
Throughout Pokémon Sword and Shield, the player and their rival Hop help Professor Magnolia’s assistant Sonia in uncovering the truth behind Galar’s history. They also work together to discover the origins of the Dynamax phenomenon that occurs nowhere else in the Pokémon world. Although at first it seems extraneous to the player’s goal of defeating Leon, it turns out Galar’s history is intrinsically linked to the energy that allows Pokémon to Dynamax and Gigantamax.
Related: Why Pokémon’s Dynamax Can’t Happen Outside Galar
Dynamax energy comes from none other than Pokémon Sword and Shield’s Eternatus, and that energy is what Chairman Rose wants to further harness for his goals. The way Eternatus nearly destroyed all of Galar is tied to the region’s history and its present regarding its renowned Gym challenge. The player, Hop, and Sonia uncovering the region’s true history allows them to put a stop to Eternatus and Chairman Rose in the end.
Eternatus caused the Darkest Day in Galar 3,000 years ago when it tried to absorb the region’s energy to sustain itself. During the Darkest Day, Pokémon underwent
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