While training for his Gym Battle at Nimbasa City, Ash and co. encounter a Cottonee along with more Cottonee that are paired up. They soon realize that it's mating season for Cottonee, but the Cottonee Ash and co. encountered is the only one that didn't pair up. So Ash and co. decide to help it. Elsewhere, Team Rocket has plans of their own for the Cottonee. Will Cottonee find his true love, or will Team Rocket ruin everything?
This episode pays homage to IL021: Bye Bye Butterfree on the fact that Cottonee, like Ash's Butterfree, is finding true love.
During the start of the episode, the colour of the apple Iris is eating constantly alternates between frames.