Fantina speaks a mix of French and broken English (only broken Japanese in Japanese version, broken French with English in French version) and is from another country. Upon arriving in Sinnoh, she decided to become a Contest performer, so she dresses up in fancy outfits for Pokémon Contests. She considers herself to be a Contest Expert and can occasionally be competed against in Super Contests, in which she uses her Drifblim, nicknamed Loony (Japanese: ばるんBalloon).
In Platinum, she is battled much earlier in the game and will make her Gym available to players as soon as they talk to her at the Contest Hall. She can be battled again at the Battleground and occasionally visits the Villa. Fantina claims to be a fan of Dahlia's dancing style and a member of the Ribbon Syndicate of the Resort Area. She also mentions making regular visits to the Lost Tower.
In her debut episode, it was revealed that as soon as she arrived in the Sinnohregion she decided to take part in Pokémon Contests. She excelled at them and, with the help of her Misdreavus, she was able to win the Grand Festival. After becoming a Top Coordinator, she was invited to assume the position of Gym Leader for Hearthome City's new Pokémon Gym, which she accepted. As a Gym Leader she was faced with new responsibilities and her desire was to offer a good battle to the many Trainers who would come to challenge her. In order to achieve that goal, she went on a journey to develop a unique battle style, combining the raw power of regular battles with the stylish moves of Pokémon Contests, and that was her reason for temporarily leaving the Gym.
Fantina has a tendency to break into dance regularly and she is also known for including French words in her sentences, such as "s'il vous plaît". As evidenced by her clothing and demeanor, she has a flamboyant personality. She likes to see that trait in others as well, as shown when she praised Jessilina's performance during the Sinnoh Grand Festival.
After training, Ash returned for an official Gym battle where Drifblim proved to be more powerful than before, managing to put to sleep and knock out Pikachu and Buizel before being defeated by Chimchar.
Gengar first appeared in a flashback in Playing The Leveling Field!. It was the first Pokémon to be used during the Gym battle against Ash in Shield with a Twist!. Gengar went up against Buizel and Ash struggled against the quick Ghost-type—however, Buizel was able to use the newly-developed Counter Shield technique and was able to defeat Gengar.
Fantina appeared in Perturbed by Pachirisu. When two women were making rude comments about rookie contestants during the Master Rank contest, she sent out her Drifblim to carry them out and throw them back where the Normal Rank contest was taking place. The next day, Fantina met Diamond, Pearl, and Platinum in person, and transported the trio on her Drifblim to the Lost Tower just as Paka and Uji had spotted Platinum. There, Diamond and Pearl treated Fantina to their comedy while Platinum witnessed a battle on the lower floors of the tower. Fantina took the trio to Solaceon Town afterwards and left.
Fantina saved Diamond and Pearl from a fall in Celestic Town, and offered to take the trio back to Hearthome, where they discovered that she was the city's Gym Leader, saying that her studies for the lifetime passion of Pokémon Contests granted her the title. Fantina watched as Platinum made her way through the quizzes given by the Gym easily and took up the challenge, after which her Drifblim was beaten after Platinum's Empoleon manipulated it into freezing itself using its own wind. Her Mismagius, however, proved to be much trickier; its Trick Room turned Empoleon's speed against it, and beat it easily. It then trapped Platinum and the borrowed Lax in an illusion where the Pokémon was in a room full of its favorite sweets and Platinum suffered. Before long though, the girl managed to subvert the illusion in her favor with Pearl's help, and defeated the Mismagius.
After the battle, Fantina and the trio learned of the disappearance of Professor Rowan and Platinum's father, Mr. Berlitz. She lent her Drifblim to the trio to assist with their emergency.
She later appeared on the Spear Pillar with the other Sinnoh Gym Leaders where she fought Team Galactic Commander Saturn along with Roark and together they defeated him. They later fought Cyrus on the top of the Spear Pillar and with the help of her fellow Gym Leaders, they managed to break his Red Chain controlling Dialga and Palkia. However, it was revealed that the one they destroyed was the artificial one he had made earlier and they were all defeated by him.
Drifblim is the first Pokémon seen on Fantina's team and is her main mode of transportation. Drifblim first appears after Platinum wins her first Pokémon Contest where she throws the two women who attempted to sabotage her Contest in the trash. Drifblim is used to take Diamond, Pearl, and Platinum to the Lost Tower and later appears at the Celestic Ruins where she saves Diamond and Pearl's lives after they fall off of a stone pillar created by Cyrus' Probopass. Fantina used her in her Gym battle against Platinum where she fought her Empoleon, and despite putting up a good fight, was defeated when Empoleon used her Blizzard to freeze her. Fantina lent her to Platinum after she learned that her father had gone missing. Drifblim was later lent to Diamond who used her in a failed attempt to stop Team Galactic from capturing Mesprit. Drifblim returned to her Trainer when the Gym Leaders arrived to confront Cyrus at the Spear Pillar.
Mismagius is Fantina's strongest Pokémon and main battler. Mismagius was first seen watching Fantina's Drifblim throw the two women in the trash after they attempted to sabotage Platinum's Contest challenge. She was used to battle Platinum in her Gym battle and she fought the Munchlax she borrowed from Diamond, using her powers to create powerful illusions before eventually being defeated by his Fling. She was later used to battle Saturn's Pokémon on the Spear Pillar and later fought Cyrus in order to destroy the first Red Chain.
Duskull was first seen rescuing Diamond and Pearl after they fell off a pillar created Cyrus' Probopass. Fantina used her against Platinum's Munchlax in their Gym battle, where she was easily defeated by Munchlax's Lick attack. She was later used to battle Saturn's Pokémon on the Spear Pillar alongside Mismagius.
None of Duskull's moves are known, and her Ability is Levitate.
Fantina's Pokémon Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.
During the Gym battle in Pokémon Diamond and Pearl, Fantina exclaims "Never give up, never surrender!", the catchphrase from the 1999 science fiction comedy Galaxy Quest.
In the Japanese and French versions she speaks English, while in the Danish, German, Italian, Portuguese and Spanish versions she has a noticeable French accent.
In the English dub of the anime, she also spoke with a French accent.
Although Fantina's dress incorporates elements of Drifblim, she only uses a Drifblim in the Gym rematch in Pokémon Platinum.
In the anime, Ash intended to battle Fantina and win the Relic Badge on his first visit to Hearthome City, as his third Badge. While this would have meant that he went out of order compared to Diamond and Pearl, this is the correct order in Platinum, which came out shortly before Ash finally battled her for the Relic Badge (as his fifth).