Ash is continuing his quest to challenge Leon, but when he and Goh arrive at Spikemuth Gym for his next Pokémon World Coronation Series battle, they discover they’ve been given the wrong directions! Gym Leader Piers gives him a ride to Wyndon, where Piers’s little sister Marnie is patiently waiting to battle. The match gets off to a roaring start, and both Marnie’s Grimmsnarl and Ash’s Gengar show off their massive powers in Gigantamax form. Although Grimmsnarl is a powerhouse, Ash and Gengar execute an unusual strategy to win the battle, catapulting Ash’s World Coronation Series ranking to 15!