Gengar's role is similar to that of the games, except that Gengar releases Zapdos and Moltres to try and to attack Ginji and Mudkip.
When they succeeded in defeating the 2 legendary birds, Gengar calls upon Team A.C.T., but they finally stopped believing in the rumors when Ninetales appeared and explained that Gengar is the actual cursed human. Gengar finally releases Groudon to attack the rescue team, but to no avail. When Groudon attacks, Mudkip tries to convince Gengar to change his heart. He finally does, and helps them save the place from being destroyed.