Giselle confronted and belittled Joe after he suffered a recent loss against Misty. During her talk with Joe, it became apparent that Giselle is a bully who cared very little for young, inexperienced Trainers. Misty angrily challenged Giselle to a battle, to which the latter agreed to. Giselle defeated Misty's Starmie with a Graveler, despite the type disadvantage. After taunting the young Gym Leader, Giselle then started to lecture her fellow students.
Ash got angry as well and argued that Pokémon training was more than types and levels – one needs to be friends with them, too. Giselle laughed haughtily and called Ash a beginner. She teased him about having been on a journey for two months and only having two Badges and three Pokémon. She then proceeded to note that Pikachu is an awful choice for a starter Pokémon, and that they were more fitting as pets for little girls. Ash and Pikachu were extremely insulted and angered, and challenged Giselle to a battle.
Giselle used a Cubone. Without being able to use Electric-type moves, Ash told Pikachu to fight back in any way it could. Pikachu then began to attack Cubone with a series of random physical attacks such as biting and scratching. Eventually, Pikachu covered Cubone's eyes with its own skull helmet and Cubone ended up knocking itself out with its own Bonemerang attack. Shocked by the defeat, Giselle admitted that people cannot learn everything there is to learn through books alone.
Team Rocket then tried to raid the school, but Giselle led the charge against them and got all of the students to assist in chasing the trio away. Joe and Giselle reconciled, and Joe left the school to collect Badges for the Pokémon League.
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This listing is of Giselle's Pokémon in the anime:
Graveler is the Pokémon Giselle chose against Misty's Starmie, to prove that she could win even at a type disadvantage thanks to her Pokémon's high level. Graveler indeed managed to defeat Starmie, knocking it out powerfully through the window and into the pool while also shattering its core.
After mocking Ash's Pikachu, Giselle chose Cubone to battle it, saying it would be "more than Pikachu's match". Pikachu's Electric attacks failed to hurt the Ground-type Pokémon, and it used Leer. Pikachu responded by staring Cubone down, but Cubone used Bone Club and Bonemerang. Eventually Pikachu covered Cubone's eyes with its own skull helmet and Cubone ended up knocking itself out with its own attack.
"Now I understand, Pokémon isn't about calculated numbers."
Giselle, to date, is the only female that Ash has found attractive enough to abandon his usual indifference towards romance. Some might argue that some other characters have made him feel this way, but Giselle is the only inarguable one thus far.
Giselle is one of the few characters in the anime whose Japanese name isn't spelled using katakana. Instead, it is spelled in kanji.
Giselle is one of the few characters to have a surname in the Japanese version.