Alder is usually roaming Unova.
Alder meets up with Marshal near Nimbasa City. The two of them have a battle in the Battle Subway, where Alder utilizes Accelgor's Acid Spray to defeat Marshal's Mienshao. Complaining about the mayor's tardiness, Alder leaves to wander around outside, where he wrestles his Bouffalant and plays wholeheartedly with the wild Pokémon, unintentionally forcing the mayor to meet with Marshal instead of Alder.
He delays for an entire day, and when he returns to the Battle Subway, Alder is surprised that the mayor is not there. He complains that the mayor is impatient and is surprised again when Marshal tells him that, as an ordinary trainer, White will be testing the Battle Subway. He hears White and Black whispering about his irresponsibility and claims that they're being harsh, though he then laughs good-naturedly, admitting that he can't argue with the truth. He tells them that he's not "playing" around, but is on a spiritual journey.
He asks White why she wants to challenge the Battle Subway so badly; White gives him a long, touching speech. His response is, besides staring blankly, to whisper to Black that her story is much better than his; meaning her reasons for challenging the Subway are better than his "spiritual journey."
He later battles N at the Pokémon League and loses.
PersonalityAlder seems cheerful and informal, smiling often; he teases Marshal by correcting his count of their win-loss record, immediately caving and laughing when Marshal earnestly corrects him. Alder is a very kind person, so kind that wild Pokémon are naturally drawn to him.
- Double Team
- Acid Spray
Bouffalant can surf (or swim) and Alder is seen riding it. Alder also wrestles with it for fun.
Marshal is Alder's serious apprentice, whom Alder enjoys teasing. Whenever the two of them meet, wherever they may be, they always have a battle.
- Alder has won against Marshal 1076 times and lost to him twice