"I am Karen of the Elite Four. You're <player>? How amusing. I love dark-type Pokémon. I find their wild, tough image to be so appealing. And they're so strong. Think you can take them? Just try to entertain me. Let's go."
"Well, aren't you good. I like that in a trainer."
After being defeated
"Strong Pokémon. Weak Pokémon. That is only the selfish perception of people. Truly skilled trainers should try to win with their favorites. I like your style. You understand what's important. Go on — — the Champion is waiting."
"I am Karen of the Elite Four. You're <player>? How amusing. I love Dark-type Pokémon. I'm known for my overpowering tactics. Think you can take them? Just try to entertain me. Let's go."
After sending out last Pokémon
"This is far from being backed into a corner!"
Last Pokémon at critical health
"You're no ordinary Trainer to have gotten this far."
"Well, aren't you good. I like that in a Trainer."
After being defeated
"Strong Pokémon. Weak Pokémon. That is only the selfish perception of people. Truly skilled Trainers should try to win with the Pokémon they love best. I like your style. You understand what's important. Go on — — the Champion is waiting."
Karen, along with Will, Green, Silver, Sham, and Carl, was one of the children raised by the Masked Man to be his servants. Unlike Silver and Green, Karen was not kidnapped and went to the Masked Man willingly out of boredom.
Karen debuts with Will at the Ilex Forest, where they were tasked to guard the area. When Green arrives to stop the Masked Man's plan to capture Celebi, she is attacked by Karen and Will. With the Ho-Oh and Lugia they borrowed from the Masked Man, Karen and Will exploit Green's fear of birds to torture her. When Green learns that Karen and Will also defeated and captured Silver, she overcomes her fear of birds and sends out Articuno, Zapdos, and Moltres to fight. Green and her allies, Red and Blue, each use one of the legendary birds to battle against Karen and Will. With the assistance of many Pokémon sent from all across Johto and Kanto, Ho-Oh and Lugia were freed from the Masked Man's control and fly away. Defeated, Karen made her escape.
After the Masked Man's defeat, Karen and Will were approached by Bruno and Koga, who offered to form an alliance since all four of them were once members of various criminal organizations.
It is revealed that Karen, Will, Bruno, and Koga were all made members of the Johto Elite Four by the Pokémon Association. The Johto Elite Four went to the Pokéathlon as an act of promotion for the Pokémon League. There, they met Gold, who they challenged to the Power Course. Karen was the only Elite Four member who didn't participate in the events.
This listing is of Karen's Pokémon in the Pokémon Adventures manga.
Eevee → Umbreon
Karen's Umbreon is Karen's main Pokémon. It was first used to battle Green's Snubbull at the Ilex Forest, but was defeated. Later, it fought Green's Snubbull while riding on top of Green's Moltres. By using the moon to power itself up, Umbreon defeated Snubbull. In The Escape, it was revealed that Umbreon evolved from an Eevee.
The Masked Man lent Ho-Oh to Karen in order to guard the Ilex Forest. Karen used Ho-Oh to battle Green, Red, and Blue, who used Articuno, Zapdos, and Moltres, respectively. During the battle, many Pokémon sent from people from Kanto and Johto came to assist. The Pokémon latched on to Ho-Oh and Lugia, and their combined power freed the two from the Masked Man's control. Now freed, Ho-Oh and Lugia flew off to parts unknown.
Red encounters Karen in A Challenge to the Elite Four! as part of the newly reformed Elite Four. Her role in this manga is similar to Lance's in the Generation II games and the remakes where she was the last one fought as Lance himself was absent.
When Red arrived in the Pokémon League, Will, Koga and Bruno fell from the Elite Four Tower, seemly defeated by Karen. Red ask them what happened, but Koga asked him to ask Karen herself. Red manages to get to the top and finds Karen, along with her's, Koga's, Bruno's and Will's Pokémon. Red asked Karen what happened between her and the rest of the Elite Four, but Karen says it is none of his business. However, with her teammates' Pokémon, Red is outnumbered. Clefairy then takes out a giant sieve to "sieve" out the opponents, leaving behind only Karen's Umbreon. Umbreon proves to be a tough opponent, but Clefairy succeeds in beating it.
After her defeat, Karen reveals to Red what actually happened. The Elite Four were exhausted from training, thus Karen decided to tell them a joke. After Karen shares the same joke to Red and his Pokémon, only Clefairy finds it funny and laugh, while Red and his other Pokémon fell down at the dumb joke. Apparently, Will, Koga and Bruno also fell down the building after hearing her dumb joke.
Vileplume was one of the Pokémon that was "sieved" by Clefairy.
Umbreon is the Pokémon that Clefairy battled with. In the first part of the battle, Clefairy treated it as a dog by showing Umbreon to some chicken, in which Umbreon liked. Later, Umbreon's Sand-Attack and Mean Look put Clefairy at a disadvantage. Tyrogue pointed out to a bright sun in which Clefairy can use to win. Clefairy uses Light Screen so that the sun's ray can reflect it and turns it into SolarBeam, which defeated Umbreon.
Karen'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.
Karen is the only Elite Four member in HeartGold and SoulSilver who does not use a Pokémon that is part of a three-stage evolutionary line in her rematch team.
She is also the only one who, in her rematch with the player, uses a different final Pokémon from the one used in the initial battle. In her case, she replaces Houndoom with Umbreon, though Houndoom is still present in her party.