Its Because when she was in kindergarten she got zapped buy a minun and plusel and got shiny, dandruff diamond hair. Then they nicknamed her Diamond Dandruff or DD for short.
Just watch episode 4 of Pokemon DP Sinnoh Leage Victors.
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because when she was in preschool they Had childhood jobs and a plusle and minun escaped so dawn tried to catch them when she caught them they tried to get out so they unleashed a electric type attack to escape it worked. then dawns friends her her hair was sticking up and it was glittering with shocks. when they got back to class dawns friend kenny yelled out dawns new nickname to the class and everybody laughed then dawn started crying by being embarrassed.
it was revealed that the reason for the name was due to her hair glittering after being shocked by the class pets in her kindergarten, Plusle and Minun, making it appear that she had Diamond Dandruff. Due to the trauma from being teased by her entire class with the nickname, she is very reluctant to let others know the origin of the name.
D=diamond
D=dandruff
this means that DD means diamond dandruff
The reason why all of Dawn's childhood friends call her Dee Dee is revealed in DP161. She hates the name because of an incident that happened when they were all in Nursery School.
Dawn, Kenny and Leona had been put in charge of taking care of the Plusle and Minun at their school - feeding them, changing their water, and cleaning their living area.
One day, however, Dawn was chasing after the two Pokémon while Kenny and Leona were diligently attending to their duties. Her two childhood friends quickly got irritated by her fooling around, and told her to do her job. Dawn, finally catching Plusle and Minun in her arms, insists that she is helping, by keeping hold of them so that they don't get in the way of changing their food and cleaning. The Cheering Pokémon in her arms cry out in protest and struggle to get free, but Dawn scolds them, telling them that it isn't time for playing.
Kenny realized that the Pokémon don't like being handled in such a way, but Dawn insists that there's "no need to worry" - she's great friends with Plusle and Minun! The two Pokémon, finally at their limit, unleash an Electric attack to get her to let go. The attack works, and as Plusle and Minun scampered off, Dawn looks completely stunned, her hair sticking out on end and glittering with static electricity. Leona asks if Dawn is okay, to which Dawn weakly answers that she was. Kenny points out how cool Dawn's hair looks, with Leona noting that it's glittering. Building off of Leona's words, Kenny reasons that rather than Hikari (Dawn), she's Pikari (Dee Dee)! Leona approves of this nickname, and declares that that would be Dawn's name from now on, though Dawn herself doesn't look too pleased.
Later on, during storytime, Dawn's glittering hair is attracting quite a bit of attention from her classmates. In the middle of the story, Kenny suddenly stands up and shouts out Dawn's new nickname to the class. Their classmates begin whispering and laughing at the nickname, causing Dawn to start crying in humiliation
Well In one episode she was playing with two electric Pokemon plusle and minun and they both shocked her in the head she had diamond sparkles in her head and it stands for diamond dandruff it's what Kenny called her
it's just a cute nickname that Kenny made up to get her goat. of course Kenny likes dawn and is showing it by calling her "Dee Dee". ;)
It means Diamond Dandruff, because a Plusle and Minun shocked her in kindergarten
never
In Pokemon Episode: Season 12: Episode: 24: "Pillars of Friendship" "If you ever have any questions about Pokemon you just let me know!"
Unfortunately, She will not be returning in Pokemon DP Sinnoh League Victors. But Dawn will be reappearing to see Iris. "If you ever have any questions about Pokemon you just let me know!
I think he saved her on Pokemon movie rise of darkai or arceus jewel of life
Dawn's last name is Hikari in the Japanese Pokemon anime, but in the English anime she doesn't have a last name..lol