• English / United States: Stephan
• Japanese / Japan: ケニヤン
• Japanese (Romanized) / Japan: Kenyan
• Japanese (Trans) / Japan: Kenyan

Stephan is a Pokémon Trainer that Ash Ketchum battled in a field on his way to Raimon City. He only started traveling recently but he's fully motivated and willing to battle. Stephan was a bit annoyed by the fact that Ash Ketchum couldn't pronounce his name correctly even after repetitively telling him the correct way to say it.

Stephan sent out his Blitzle to battle Ash's Oshawott. He was a bit surprised that Ash Ketchum sent out a Water type Pokémon against him even though he knew that his Blitzle was an Electric type. Stephan was a bit surprised by Ash's Oshawott's scallsword defense but he quickly changed tactics a Ash's Oshawott ended up loosing his scallsword. Ash Ketchum called time out on their battle and Cilan rescheduled the battle till the next day. Stephan camped out for the night nearby.

In the rematch battle, Stephan had powered up his Blitzle by using his own power-generating equipment that he made to inject the power into Blitzle. Even after being powered up, Stephan's Blitzle lost to Ash's Oshawott. Stephan vowed to get stronger and have a rematch with Ash Ketchum someday.

Don George Tournament - Raimon Town

Stephan decided to enter the Don George Tournament in Raimon Town where he met some of his other rivals again. In the first round of the Don George Tournament, Stephan's Zebstrika was matched up against Bianca's Minccino. Bianca's Minccino used Tickle to be a battle distraction but Stephan's Zebstrika was able to compose itself and defeat it with a strong Stomp. Stephan's Zebstrika's win advanced Stephan into the second round of the tournament.

In the second round of the Don George Battle Tournament in Raimon Town, Stephan's Sawk battled against Iris' Emolga but Emonga's Static ability proved to be the deciding factor in the match. The Static ability ended up paralyzing Stephan's Sawk and it was then a sitting target for Iris' Emolga's Volt Switch which knocked it out. Stephan's Sawk loss eliminated Stephan from the tournament.

Fukiyose Tower Bell of Wishes Festival

Stephan met up with Ash Ketchum and his friends and informed them of the Fukiyose Tower Bell of Wishes Festival that he was going to participate in. After hearing from him that it was an awesome event held once a year at the Fukiyose Tower, Ash Ketchum and his friends decided to enter the tournament with Stephan. Stephan and Stephan's Sawk paired up together and the two of them proved to be a good combination after the trivia quiz as they were almost eliminated in the first round on a simple question. In the imitation round, Stephan's Sawk dressed up as Nurse Joy's Audino to complement Stephan who dressed up as Nurse Joy (Unova). Miles commented that they looked a bit little creepy, but he was generous and narrowly passed them. Ash Ketchum and Pikachu were neck and neck with Stephan and Stephan's Sawk until the very end when Stephan's Litwick candle ended up being a real Litwick and blew out Ash Ketchum's candle flame to give Stephan the victory. Despite the controversy, Miles declared Stephan the victor. Stephan was given the right to ring the Bell of Wishes and he wished that he would win the upcoming Donamite tournament.

Donamite Tournament

Stephan had high hopes for this tournament as he has wished to win this tournament when he rang the Bell of Wishes. He was the one that told Ash Ketchum and his friends about the tournament and he noted that all Trainers who participate in it take pride in their skills and have heated battles. In the first round of the tournament, Stephan faced Edmund who he was able to defeat and successfully move on to the second round.

In the final round, Montgomery's Throh was finally matched up against Stephan's Sawk. The two had been taunting each other throughout the tournament and the fight lived up to the anticipation. The two trades blows until Stephan's Sawk was able to land a very powerful Close Combat that Montgomery's Throh was unable to block. Realizing that it had won the match, Stephan's Sawk bowed and walked away as Montgomery's Throh tried to continue but was knocked out. The victory eliminated Montgomery from the tournament and Stephan was declared the victor. Montgomery was surprised to have lost the tournament, but he showed his humble side and shook hands with Stephan, accepting the loss. He told him the next time they fought he would win and Stephan said he'd win again.

Isshu League Tournament

In the preliminary round of the Isshu League, Stephan was matched up against Radley and Stephan's Zebstrika was matched up against Radley's Braviary and easily defeated it. As a result Radley was eliminated from the competition.

In the first round, the scoreboard showed that Stephan was matched up against a girl who he defeated and moved onto the second round. In the second round, Stephan faced a Trainer that had a Gurdurr and the battle was briefly shown and Stephan's Sawk defeated it to allow Stephan to move on to the third round.

In the third round, Stephan was matched up against Ash Ketchum. Cilan noted that the two of them have a very direct taste and that it would be a good battle. It was only a 3 on 3 battle but the both of them gave it their all. The first two battles of the third round setup the final match up of Stephan's Sawk vs Ash's Krookodile, both of which were very injured from the previous battles. Both of them did their best to muster up their reserve strength but in the end a surprise move of Aerial Ace by Ash's Krookodile was super effective against Stephan's Sawk and it knocked it out to give Ash Ketchum the victory while eliminating Stephan from the tournament. Stephan realized after the battle that the reason that Ash Ketchum withdrew Waruvial after the first battle was because Ash Ketchum knew that Stephan would definitely send out Dageki, so he didn't reveal that it knew Aerial Ace and saved until the end.