|Anime debut||Zoroark: Master of Illusions|
|English voice actor||Bella Hudson|
|Japanese voice actor||Natsuki Katō|
At the beginning of the film, Rowena appears as Grings Kodai's secretary. Though intelligent, she is timid and easily frightened; during a demonstration of Zoroark's abilities, she needs to be reassured by her boss that Zoroark's attacks are only illusions and reminded that she possesses an "Illusion Canceler" device like Kodai himself and Goone do.
She later accompanies Kodai and Goone into Crown City to hunt for Celebi. Kodai assigns the two of them to thwart the forseen interference of Ash and his friends while he examines the city's Pokémon Baccer World Cup countdown clocks in his search for the Time Ripple.
When the duo finds Ash and his friends, Goone leaves Rowena to deal with them while he returns to aid Kodai. It is here that Rioka reveals her true identity: she removes her glasses, lets down her hair, and reveals that she is actually a reporter and colleague of Karl, working undercover to reveal Kodai's secrets. With her help, the group is able to hack into Kodai's computer network and determine the last countdown clock he has not yet checked, allowing them to race to its location in an attempt to stop him. She is later seen at the Pokémon Baccer Stadium with Karl watching as Ash faces off against Kodai.
Along with Karl, she later publishes the story exposing Kodai's scheme and his imprisonment. She is last seen sailing off to Unova with Karl, Zorua and Zoroark accompanying her.
|Korean||리오카 Rioka||Transliteration of her Japanese name.|
|Chinese (Taiwan)||莉歐卡 Lì'ōukǎ||Transliteration of her Japanese name.|