Mismagius is one of Zoey's Pokémon she caught as a Misdreavus before Dawn's first Contest in Jubilife City. Misdreavus performed on the appeal stage of the contest and Misdreavus used Double Team. It then used Confuse Ray to send the illusions away and used Shock Wave to display its power. Its appeal allowed Zoey to advance to the battle rounds. Misdreavus later appeared with Glameow to warn Ash, Dawn and Brock that Zoey was in trouble, as she got hurt.
Misdreavus was briefly seen during the Wallace Cup, defeating a Mothim, thus allowing Zoey to advance further in the competition. Before the Sinnoh Grand Festival, Zoey had Misdreavus evolve into Mismagius using a Dusk Stone and learn some new moves. It battled with Zoey's Leafeon against Nando's Kricketune and Lopunny. Mismagius and Leafeon were put at an early disadvantage due to Kricketune's singing with Lopunny's dancing. However, Mismagius helped Zoey make a comeback with a Double Team trick and using Lucky Chant to counter Kricketune's Sing. At the end of the performance, Mismagius used Psywave to boost Leafeon and the incredible combination was enough to allow Zoey to advance to next round.