Harley is a tall boy with long, wavy purple hair and blue eyes. He wears a green hat that is similar to Cacturne's head, a blue shirt that has a cut rectangle which exposes his belly, a collared jacket and pants that are green in color with a darker zigzag pattern on both of his sides, a white belt with a yellow button and white-heeled shoes.
Harley is a tricky, untrustworthy, quirky, jumpy and certainly not afraid to tell what is on his mind and he is extremely sensitive towards May (who is his initial enemy). He prefers using his eccentric manners to draw the audience's attention.
Despite his nice and friendly personality to gain other's respects, he actually makes a distraction to make his enemy lose control, then he makes his move and strikes the opponent's Pokémon down in battle. If anyone gives him criticism that vexes him, he will go great lengths to seek his revenge. At first, Harley is extremely towards May, such as despicably framing or deliberately deceiving her, but soon he begins to acknowledge her as a worthy opponent.
Pokémon the Series: Ruby and Sapphire
Harley visited May and Bulbasaur on the boat to Izabe Island where he expressed how her Bulbasaur was amazing in her training. May thanked him and introduced herself to Harley. She didn't know much about Cacturne and scanned it with her Pokédex. Harley was angered by this, even more when she noted how scary Cacturne looked. After May commented on how his cookies weren't half-bad, Harley ran away and took a picture of her from a distance. On that moment, Harley promised to teach May a lesson in the Contest. Before the Contest began, Harley offered Max some ice-cream. Max was grateful and Harley fooled him into telling May's incident with Tentacool in the past. Harley thanked him and ran to May, where Harley apologized for forcing Max to spend some time with him. During the first round, Harley sent his Cacturne, which made the audience speechless upon how terrifying Cacturne looked. Harley had Cacturne use Bullet Seed, which made an image of a skull and crossbones. Harley saw May passing the first round and thought that May wasn't a bad Coordinator at all.
In the next round, Harley's Cacturne defeated the opponent's Azurill quite quickly. Just as May went to the stage, he lied to her that her opponent's Surskit are known for their slow speed. He was furious that May won the round, though he promised to make an alternate plan. Before the final round began, May questioned Harley for giving her bad advice, but Harley claimed that she should've studied her opponents first. Harley's Cacturne took damage from Bulbasaur's Vine Whip and Tackle. Just as May was to finish the battle, Harley activated the tape, in which Max told the story about May and Tentacool. Harley taunted May, who became embarrassed and outraged, wanting to make Harley pay. However, her Bulbasaur missed attacks, while Cacturne continued attacking Bulbasaur. Fortunately, Ash's advice made May calm down as she had Bulbasaur use Vine Whip to bind Cacturne, then Razor Leaf and Petal Dance to defeat it. Harley lost and called Cacturne back. He claimed May won just by pure luck and promised to face her again, but in different circumstances.
Before arriving to Slateport City for May's Grand Festival, she and Ash remembered their past adventures so far. May recalled meeting Harley and his Cacturne, the former being really annoyed by her "lack of knowledge and odd behavior". Harley was annoyed by her and placed her in his book, marking her as his enemy. Harley also gave May some fake advice, which nearly costed May the Contest. However, May made a turnaround and defeated Kent and his Surskit. In the final round, May's Bulbasaur battled against Harley's Cacturne and eventually defeated it. However, Harley was still determined to pay back to May.
Harley encountered Drew and May at Slateport City, the site of the Grand Festival. Despite the previous incident, Harley behaved quite politely, and wanted to bury the animosity towards him and May, to which she accepted. He even remarked Drew's rose to May, thinking there was "magic in the air", which made May blush. As Drew walked away, Harley went away, maliciously smiling that his second plot to get revenge at May was working. He also noticed "Norman" in a crowd. Harley later visited May, complimenting her training with Beautifly. He advised her to simply have Beautifly use Silver Wind in the contest, thinking that would earn her a lot of points. He even claimed he wanted to see her win, even at the cost of his loss, for he didn't wish anything ill towards her. May inspired him to strive for victory as well, since he did work hard to reach this place, and to respect her as an equal. She was convinced to adapt the Silver Wind strategy, but Drew, who had his doubts over Harley's intentions, claimed that strategy had no depth and shouldn't be used. Harley dismayed him, stating he was just jealous.
Drew ignored him, but continued to keep a close eye on him. He even suggested she could use professional help, and stated Norman was around. Much to others shock, they told that he was supposed to be home, and went to find him. Harley was shocked to hear that Norman was May's father, and led the group to the tent, where "Norman" and his manager were taking Pokémon for training. It turned out to be Team Rocket in disguise, whom Ash and May quickly defeated. Harley applauded the latter, making her more confident in the Silver Wind strategy. During the preliminary round, Harley's Cacturne scored 84 points, enough to enter the tournament. When he returned to the waiting room, Harley was surprised to see that his attempt to sabotage May backfired when she got 88 points with the Silver Wind strategy. As Drew appeared, Harley waved to him, but Drew shrugged him off.
Harley requested May to train with him, an offer she accepted. During this training, her Skitty used Assist, which turned into Silver Wind. Harley complimented her, advising that she should aim to have Skitty use Assist at all times. He visited her later, thinking she was looking for Drew. However, May stated there was a fraud among them, which shocked Harley. At any rate, during his round, he sent Banette, who used Will-O'-Wisp, followed with Thunder. Despite the strange and scary look that Banette made, Harley scored 89 points. Harley watched her performance, and was annoyed how lucky she got with her Assist moves. However, once Skitty became confused, due to Assist being turned into Petal Dance, Harley gloated that his plan was successful. Drew heard this, and confronted him on that. Drew pointed out Harley wasn't May's friend, to which he stated it was just "competition".
When May returned to the waiting room, Drew unveiled the news to her that Harley was trying to foil her success. May was angry at Harley, but didn't understand why he did this. Harley simply stated this was his revenge on the events that happened in the previous Contest. Harley claimed she shouldn't trust other people, then he pushed her aside and walked away. He came out of the stadium, and looking at Drew, who scored a perfect score, was not impressed by his performance. Later, Harley, in the next round, saw that his next opponent would be May. In that round, Harley sent Banette and Cacturne, while May sent Beautifly and Bulbasaur. May demanded of him to battle fairly, to which Harley stated that had different meanings of the word "fair". May braced herself, as she promised to play rough and defeat Harley.
May gained the upper hand quite early, as her Bulbasaur bound Cacturne and Banette's legs, letting Beautifly hit them with Silver Wind. Harley had his Pokémon counterattack, by attempting to have Cacturne use Pin Missile against Bulbasaur's Petal Dance. This distraction let May's Pokémon use Razor Leaf and Silver Wind, which knocked down Harley's Pokémon and depleted his points. Harley was frustrated, and walked away, passing by a smiling Drew. Harley commented that Drew was happy that he had lost. Drew replied that May was just better that day, but Harley doubted his words. He later watched the battle between Drew and May. Despite the latter's loss, the crowd cheered her on, which devastated Harley that there was "no justice in this world".
Harley is very scheming and will use any means to defeat and/or humiliate his opponent. In A Cacturne for the Worse he tells May that Surskit is slow so she should let her Bulbasaur get in close before striking, almost costing her the win. He also records her little brother, Max, telling an embarrassing story about her and a group of Tentacool and plays it during the contest, effectively stressing her out until Ash tells her to calm down. He also allies himself with Team Rocket in the episodes New Plot, Odd Lot! and Going for Choke!. In Hi Ho Silver Wind! and Deceit and Assist, he tells May to use her Skitty's Assist move in the next match, causing it to become confused.
Harley has lost most of his contests against May despite his cheating and deception, except for one, in Harley Rides Again. He still manages to get plenty of ribbons from other contests and has enough to enter the Grand Festival, as he has won over ten contests.
When May entered contests in Kanto, it was revealed that Harley was travelling through Kanto too. He tried to make her lose her chance to enter the first Pokémon contest they participated in but May got a Kanto Contest Pass and defeated Harley's Ariados using her Squirtle. The next time he appeared was in Harley Rides Again, where he competed in the Wisteria Town Contest, using Ariados in the appeals. He used Ariados's Spider Web to surround the stage with its web, similar to the previous contest. He then asked it to entangle itself with its web and use Scary Face, scaring everyone. He then used his Octillery against May's Munchlax in battle. After utilizing Octazooka, Sludge Bomb and Rest, he defeated May for the first and only time known so far.
He appeared again in New Plot, Odd Lot! and Going for Choke!. This time after learning that May needed one more ribbon to enter the Grand Festival, he devised a plan to prevent this. To do this, he enlisted the help of Team Rocket, promising to help Jessie win and having James and Meowth help him sabotage May behind the scenes. However Ash, Brock, Max and Drew got wind of this and thwarted his plan. Despite Harley's plans, May ended up winning her last ribbon. Harley then decided to challenge her in the grand festival, he also seemed determined to defeat her.
In New Plot, Odd Lot!, it was also mentioned that part of Harley's hate for May came from when a girl who looked like May ate his food when he was younger.
The next time was in May, We Harley Drew'd Ya!, Thinning the Hoard, and Channeling the Battle Zone, where he competed against May in the Kanto Grand Festival. In the Appeals Round, he used his Banette while dressed up as May, asking himself to be called Mayley. He used Cacturne and Wigglytuff against Munchlax and Eevee, but both defeated his Pokémon.
The final major appearance he had was in The Unbeatable Lightness of Seeing where he simply watched May and Drew have a practice contest battle. At the end of the episode, he revealed that he was also going to compete in Contests in Johto. He also invited Jessie to do the same, but she denied, saying she still wanted to stay in Team Rocket. Because of this, he got mad at her. He then sent out his Cacturne to battle her. As she was searching for a Pokémon to use, Harley asked Cacturne to use Bullet Seed, sending Team Rocket flying with Jessie still looking for a Pokémon.
He has Contest Passes to compete in Hoenn, Kanto and presumably Johto, as well.
Pokémon the Series: Diamond and Pearl
In May's flashback, Harley and his Wigglytuff appeared.
- Dutch: Tony Neef
- German: Johannes Raspe
- Korean: Yang Seok-Jeong
- French: Romain Barbieux
- Brazilian portuguese: Marcelo Campos (first appearence), Dado Monteiro (other appearences)
- Harley is the first person to suspect that May and Drew have feelings for each other. However, it's possible that he was just doing it to mess with them.
- Harley has only ever managed to beat May once in a battle as May has beaten him every other time.