Emmet can be battled in a Double Battle on the Double Train once the player has acquired a 20 win streak, and on the Super Double Train once the player has acquired a 48 win streak. He can also be fought alongside his brother Ingo in a Multi Battle on the Multi Train once the player has acquired a 20 win streak, and on the Super Multi Train once the player has acquired a 48 win streak. His teams in both Black and White and Black 2 and White 2 are identical.
"I am Emmet. I am a Subway Boss. I like Double Battles. I like combinations of two Pokémon. And I like winning more than anything else. So let's start a great battle in which every Pokémon uses various moves."
"I am Emmet. I won against you. But I think I just got lucky. In a Double Battle, if you misread one thing, the rest will be totally different. You know. Please win 20 battles in a row, and fight with me!"
"I am Emmet. I lost against you. Because you are the strongest Trainer I've fought lately. You're a verrrrry strong Trainer! Yup! It was fun! Ride the trains some more!"
Super Double Train
"Hi, do you remember me? I am Emmet. I am a Subway Boss. I like Double Battles. I like combinations of two Pokémon. And I like winning more than anything else. This time, I am really serious. Really serious. Because if a battle is not serious, it is not fun."
"I am Emmet. I won against you. But this is not the end. I am sure you will show up here again. I will wait for it and win against you again. Because I am a Subway Boss. I am Emmet."
"I am Emmet. I am a Subway Boss, but I lost against you again. But I feel good. Because it was very fun! You want to win, and I don't want to lose. That's real. When we clash in battles, I feel very excited!"
"Follow the rules. Safe driving! Follow the schedule. Everybody smile! Check safety. Everything's ready! Aim for victory! All aboard!"
"I am Emmet. I won together with Ingo. But if we fight again, we won't know what to expect. That's why we are waiting for you to come back!"
"I am Emmet. I lost together with Ingo. Your combination is the best, perfect! You're verrrrry strong Trainers. Yup! It was so much fun!"
Super Multi Train
"What I do. What I say. Always the same. Follow the rules. Safe driving! Follow the schedules. Everyone smile! Check safety. Everything's ready! Aim for victory! All aboard!"
"I am Emmet. We won, but I am not really satisfied. I can tell that you won't give up. Because you will be much, much stronger. That's why we are waiting for you to come back!"
"I am Emmet. We lost against you again. But I am satisfied. You are too strong! The strength you have, your trust in your Pokémon, their never-ending support! Yep! It was the most fun battle ever! Please come back soon!"
Emmet and his brother reappeared in Lost at the Stamp Rally!, where they helped Erina locate her lost Axew as a favor for Cilan. They rewarded his and Ash's good deed by having a Tag Battle against them, who were using Pansage and Tepig respectively. Despite Ash and Cilan pushing their hardest, they were finally defeated as Ingo's Chandelure stopped the two Pokémon with Psychic, so Emmet's Eelektross was able to knock them out with a Thunderbolt.
Emmet, along with Ingo, made an appearance in A Surface to Air Tag Battle Team! as part of a fantasy made up by Soren, who boasted that both he and his brother Rocko had beaten the Subway Bosses in a Tag Battle. However, this claim was quickly disproved by Rocko.
Emmet debuts in the Black & White chapter. He, along with his brother Ingo, is first seen walking around Gear Station. The are later properly introduced as the Subway Bosses for the newly-created Battle Subway to Black and White. According to the Mayor of Nimbasa City, they were recruited by him because of their strength. White later decides to to take part in a test run of the Battle Subway, which she uses as a way to learn how to become a Trainer.
As the three travel, White is pitted against Virtual Trainers while the twins evaluate her progress. Emmet's love of battling and impatience leads to him constantly asking White to win 20 consecutive battles so that they can have a battle. This behavior repeatedly scares White, which forces Ingo to apprehend his brother and drag him away.
Sometime later, the train arrives at Anville Town, the final stop. At this point, White's skills have improved to the point where she can battle one of the Subway Bosses, much to Emmet's delight. Emmet referees a battle between White and Ingo, which ends in a tie, to Ingo's frustration. After stepping out for a bit, White returns with Bianca, a friend of hers. White asks the twins to take her to Castelia City so that she can help Bianca with her troubles. Afterward, White returns to continue her training.
After more traveling, White finishes her training and goes her separate ways from the Subway Bosses.
Durant is Emmet's only known Pokémon. It was first seen next to Emmet while White was testing the Battle Subway.