At the start of his battle against the Hood Man at the Unova Pokémon League, Marlon sent out his Jellicent, while his opponent sent out his Beheeyem. He ordered it to use Scald, which soaked and burned Beheeyem. Hood Man told Marlon that it was okay as it could recover itself. He had Beheeyem use Calm Mind and Energy Ball, which was a direct hit. Marlon became excited and told Hood Man that his Jellicent can also recover. Jellicent then wrapped its tentacles around Beheeyem, which was due to its ability, Cursed Body, which made Beheeyem unable to use Energy Ball. As Beheeyem's shadow moved, to the shock of Marlon, it hit Jellicent. The commentator for the match said it was Shadow Ball and that the battle was over, saying that Jellicent was defeated an Beheeyem won.
After his battle against the Hood Man, Marlon carried Jellicent on his back. White recovered Jellicent with Nancy, so she could ask Marlon a few questions on the Hood Man.