Dr. Wiseman is a Pokémon collector obsessed with studying rare and unusual variations—best known for his appearance in "Fowl Play!" He relocated to a remote forest cabin specifically to track down an elusive Shiny Noctowl, convinced that catching it would be the achievement of a lifetime. The problem was the Noctowl kept outsmarting him at every turn.
Eventually Wiseman swallowed his pride and asked Ash and the group for help with his capture scheme. Things went sideways when Team Rocket showed up trying to steal the Noctowl for themselves. Ash, unwilling to let the Pokémon get hurt, broke it free from Team Rocket's mecha. In gratitude, the Noctowl actually helped Ash's team figure out how to beat Team Rocket, leading to the usual blastoff.
Wiseman took the hint after that. He realized the Noctowl had no interest in being caught by him—it wanted to stay with Ash—so he backed off and let Ash catch it instead. Sometimes you can't force these things.
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