Pokemon Best Wishes! - episode 51 - 05 Oct, 2011

Cilan decides that he wants to go back to the subway so he can challenge the Subway Masters Ingo and Emmet in a match by collecting enough stamps. Ash and Iris decide that they want to see the rest of Nimbasa City, but along the way, they spot a lost Axew with a bow on her tail, and must help it find its trainer. (Source: Wikipedia)