In the following episode , Pikachu battled Miltank again in Ash's rematch. Pikachu was then recalled.

Mime who directs them to an illegal underground fighting arena owned by Sebastian, whose Charizard previously lost a battle to Pikachu. All Things Bright and Beautifly!

Curious how Pikachu became a sleuth? On their way they got attacked by the flaming ghost again and Pikachu decided to battle it. Retrieved 27 November